Mijia Air Conditioner Error Code FAQ
Q1: What to do if F1.1 is displayed on the Mijia Air Conditioner?
A: If F1.1 is displayed on the Mijia Air Conditioner, which indicates that the ambient temperature sensor of the indoor unit is malfunctioning, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q2: What to do if F1.2 is displayed on the Mijia Air Conditioner?
A: If F1.2 is displayed on the Mijia Air Conditioner, which indicates that the ambient temperature sensor of the outdoor unit is malfunctioning, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q3: What to do if F2.1 is displayed on the Mijia Air Conditioner?
A: If F2.1 is displayed on the Mijia Air Conditioner, which indicates that the ambient temperature sensor of the indoor unit pipeline is malfunctioning, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q4: What to do if F2.2 is displayed on the Mijia Air Conditioner?
A: If F2.2 is displayed on the Mijia Air Conditioner, which indicates that the ambient temperature sensor of the outdoor unit pipeline is malfunctioning, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q5: What to do if F2.3 is displayed on the Mijia Air Conditioner?
A: If F2.3 is displayed on the Mijia Air Conditioner, which indicates that the temperature sensing pack of the indoor unit pipeline is malfunctioning, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q6: What to do if F2.4 is displayed on the Mijia Air Conditioner?
A: If F2.4 is displayed on the Mijia Air Conditioner, which indicates that the temperature sensing pack of the outdoor unit pipeline is inefficient, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q7: What to do if F3.1 is displayed on the Mijia Air Conditioner?
A: If F3.1 is displayed on the Mijia Air Conditioner, which indicates that the air emission temperature sensor of the outdoor unit is malfunctioning, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q8: What to do if F3.2 is displayed on the Mijia Air Conditioner?
A: If F3.2 is displayed on the Mijia Air Conditioner, which indicates that the air emission temperature sensing pack of the outdoor unit is inefficient, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q9: What to do if F4 is displayed on the Mijia Air Conditioner?
A: If F4 is displayed on the Mijia Air Conditioner, it indicates that the carbon dioxide sensor of the indoor unit is malfunctioning, or loose connectors, sensor board abnormality, mainboard abnormality, etc. When F4 is displayed, the air conditioner can be operated normally, but some functions will be affected. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q10: What to do if F5 is displayed on the Mijia Air Conditioner?
A: If F5 is displayed on the Mijia Air Conditioner, it indicates that the humidity sensor of the indoor unit is malfunctioning, or loose connectors, sensor board abnormality, mainboard abnormality, etc. When F5 is displayed, the air conditioner can be operated normally, but some functions will be affected. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q11: What to do if E0 is displayed on the Mijia Air Conditioner?
A: If E0 is displayed on the Mijia Air Conditioner, it indicates that the fan motor of the indoor unit is malfunctioning, the indoor unit mainboard is abnormal, the mainboard and motor are connected abnormally, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q12: What to do if E1 is displayed on the Mijia Air Conditioner?
A: If E1 is displayed on the Mijia Air Conditioner, it indicates that the motor controlling procedure is malfunctioning, the motor controlling parameters of the outdoor unit are mismatched, the motor controlling board of the outdoor unit is abnormal, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q13: What to do if E2 (E2.1/E2.2/E2.3/E2.4/E2.5/E2.6/E2.7) is displayed on the Mijia Air Conditioner?
A: If E2 (E2.1/E2.2/E2.3/E2.4/E2.5/E2.6/E2.7) is displayed on the Mijia Air Conditioner, it indicates that the fan motor of the outdoor unit is malfunctioning, the motor controlling board of the outdoor unit is abnormal, the motor and the mainboard are connected abnormally, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q14: What to do if E3 is displayed on the Mijia Air Conditioner?
A: If E3 is displayed on the Mijia Air Conditioner, it indicates that the communication between the mainboard and the display panel of the indoor unit is malfunctioning, the mainboard and the display panel of the indoor unit are abnormal, the connection between the mainboard and the display panel of the indoor unit, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q15: What to do if E5 is displayed on the Mijia Air Conditioner?
A: If E5 is displayed on the Mijia Air Conditioner, which indicates compressor overheating protection, meaning the compressor temperature is too high, you can try powering off the air conditioner for 10 minutes or longer to allow the temperature to drop and restart it to resume the operation.
If E5 is always displayed, please refer to the following methods for troubleshooting:
1. Check whether the outdoor unit is too dirty and clean it when convenient.
2. Check whether the outdoor unit is placed in direct sunlight, which can cause poor heat dissipation.
3. Check whether the outdoor unit is placed inside a grille, which can cause poor heat dissipation, and remove the grille.
4. Check whether the voltage is too low. If so, please use a voltage regulator.
Q16: What to do if E6.1 is displayed on the Mijia Air Conditioner?
A: If E6.1 is displayed on the Mijia Air Conditioner, it indicates a communication error between the mainboards of the indoor and outdoor units. A severely low voltage (e.g., below 130 V) can cause this error. You should contact a professional electrician to check the wiring. This case could also be caused by issues with the connection cable between the indoor and outdoor units, or problems with the control board of the indoor or outdoor units. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q17: What to do if E6.2 is displayed on the Mijia Air Conditioner?
A: If E6.2 is displayed on the Mijia Air Conditioner, it indicates a communication error between the mainboards of the indoor and outdoor units. A severely low voltage (e.g., below 130 V) can cause this error. You should contact a professional electrician to check the wiring. It could also be caused by a connection cable error between the indoor and outdoor units, or problems with the control board of the indoor or outdoor units. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q18: What to do if E8.1 is displayed on the Mijia Air Conditioner?
A: The display of E8.1 on the Mijia Air Conditioner indicates a communication failure in the outdoor unit’s electronic control system. It can also be caused by problems such as the outdoor unit electrical control panel. Please turn off the air conditioner and disconnect it from the power source. Wait for approximately 3 to 5 minutes before reconnecting the power. Then, turn the device back on and check if the issue is resolved. If the problem is not resolved through a power restart, it is recommended to apply for after-sales service for further inspection. A professional technician can diagnose the issue and provide the necessary repairs to restore normal operation.
Q19: What to do if E8.2 is displayed on the Mijia Air Conditioner?
A: If E8.2 is displayed on the Mijia Air Conditioner, it indicates a communication error of the indoor unit electronic control system, or problems with the electrical control panel of the indoor unit. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q20: What to do if E8.3 is displayed on the Mijia Air Conditioner?
A: If E8.3 is displayed on the Mijia Air Conditioner, which indicates a communication error of the line controller, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q21: What to do if FF is displayed on the Mijia Air Conditioner?
A: If FF is displayed on the Mijia Air Conditioner, which indicates a communication error of the display panel of the indoor unit, or the problems with the display panel, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q22: What to do if E9 is displayed on the Mijia Air Conditioner?
A: If E9 is displayed on the Mijia Air Conditioner, which indicates a water level alarm error (floating switch), you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q23: What to do if EC is displayed on the Mijia Air Conditioner?
A: If EC is displayed on the Mijia Air Conditioner, which indicates the three-phase power loss protection, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q24: What to do if E4 is displayed on the Mijia Air Conditioner?
A: If E4 is displayed on the Mijia Air Conditioner, which indicates a fan motor fault in the fresh air system, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q25: What to do if U0 (U0.0/U0.1/U0.2/U0.3) is displayed on the Mijia Air Conditioner?
A: If U0.0 is displayed on the Mijia Air Conditioner, it indicates an electrical control voltage fault in the outdoor unit, which is caused by excessive voltage fluctuations. Try waiting for the voltage to stabilize before turning it on again to see if the problem is resolved. If the voltage is not stable for a long time, please install a voltage regulator. If this case persists, it is recommended that you apply for the after-sales inspection.
Q26: What to do if U1.1 is displayed on the Mijia Air Conditioner?
A: If U1.1 is displayed on the Mijia Air Conditioner, it indicates a current fault in the outdoor unit’s electrical control module, problems with the motor control board or compressor of the outdoor unit, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q27: What to do if U1.2 is displayed on the Mijia Air Conditioner?
A: If U1.2 is displayed on the Mijia Air Conditioner, it indicates a current error in the outdoor unit electrical control module. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q28: What to do if U1.3 is displayed on the Mijia Air Conditioner?
A: If U1.3 is displayed on the Mijia Air Conditioner, it indicates a current error in the compressor, problems with the electrical control board or the compressor of the outdoor unit, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q29: What to do if U2 (U2.1/U2.2/U2.3) is displayed on the Mijia Air Conditioner?
A: If U2 (U2.1/U2.2/U2.3) is displayed on the Mijia Air Conditioner, which indicates the over-current protection of the outdoor unit electrical control module, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before turning on the air conditioner. If the voltage remains unstable for an extended period, please install a voltage regulator.
2. Check whether the heat exchanger of the outdoor unit is blocked. Clean the heat exchanger when convenient.
3. Check whether the air conditioner is placed inside a grille, which will cause poor heat dissipation. If so, please remove the grille.
4. Check whether the filter of the indoor unit is blocked and dirty, and clean the filter.
5. Check whether the airflow from both the indoor and outdoor units is obstructed. Remove any obstructions from the outdoor unit.
6. If a protection code appears in a high-temperature environment, but the air conditioner is still operating normally, this is normal and will automatically disappear as the temperature drops.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q30: What to do if U3 is displayed on the Mijia Air Conditioner?
A: If U3 is displayed on the Mijia Air Conditioner, it indicates a startup error of the outdoor unit drive, problems with the electrical control board and the fan motor of the outdoor unit. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q31: What to do if U4 (U4.1/U4.2/U4.3/U4.4) is displayed on the Mijia Air Conditioner?
A: If U4 (U4.1/U4.2/U4.3/U4.4) is displayed on the Mijia Air Conditioner, it indicates the disynchronization protection of the compressor. Please refer to the following steps for troubleshooting:
1. The shutdown time is insufficient. Wait 3 to 5 minutes after shutdown before restarting.
2. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q32: What to do if U5 is displayed on the Mijia Air Conditioner?
A: If U5 is displayed on the Mijia Air Conditioner, which indicates the phase loss protection/reverse phase protection of the compressor, please refer to the following steps for troubleshooting:
1. The shutdown time is insufficient. Wait 3 to 5 minutes after shutdown before restarting.
2. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q33: What to do if U6.1 is displayed on the Mijia Air Conditioner?
A: If U6.1 is displayed on the Mijia Air Conditioner, which indicates the temperature protection of the outdoor unit electrical control module, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
3. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
4. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q34: What to do if U6.2 is displayed on the Mijia Air Conditioner?
A: If U6.2 is displayed on the Mijia Air Conditioner, which indicates the temperature sensing pack of the outdoor unit electrical control module, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
3. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
4. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q35: What to do if U8.1 is displayed on the Mijia Air Conditioner?
A: If U8.1 is displayed on the Mijia Air Conditioner, which indicates the over-current protection of the PFC hardware in the outdoor unit, please refer to the following steps for troubleshooting:
1. The shutdown time is insufficient. Wait 3 to 5 minutes after shutdown before restarting.
2. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q36: What to do if U8.2 is displayed on the Mijia Air Conditioner?
A: If U8.2 is displayed on the Mijia Air Conditioner, it indicates the over-current of the PFC software in the outdoor unit, which is caused by the unstable voltage. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator. The problem with the electrical control board of the outdoor unit is also one of the reasons. If this case persists, it is recommended that you apply for the after-sales inspection.
Q37: What to do if U8.3 is displayed on the Mijia Air Conditioner?
A: If U8.3 is displayed on the Mijia Air Conditioner, which indicates the over-current protection of the PFC efficient value in the outdoor unit, please refer to the following steps for troubleshooting:
1. The shutdown time is insufficient. Wait 3 to 5 minutes after shutdown before restarting.
2. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q38: What to do if C1 is displayed on the Mijia Air Conditioner?
A: If C1 is displayed on the Mijia Air Conditioner, which indicates the system automatically reduced the compressor's operating frequency because the outdoor unit's electrical control module detected that the current exceeded the safety limit, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The filter of the indoor unit is blocked. Please clean the filter.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q39: What to do if C2 is displayed on the Mijia Air Conditioner?
A: If C2 is displayed on the Mijia Air Conditioner, which indicates the system automatically reduced the compressor's operating frequency because the outdoor unit's control board detected that the AC current exceeded the safety limit, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The filter of the indoor unit is blocked. Please clean the filter.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q40: What to do if C3 is displayed on the Mijia Air Conditioner?
A: If C3 is displayed on the Mijia Air Conditioner, which indicates the system automatically reduced the compressor's operating frequency because the outdoor unit compressor drive module is overheating, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The filter of the indoor unit is blocked. Please clean the filter.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q41: What to do if C4 is displayed on the Mijia Air Conditioner?
A: If C4 is displayed on the Mijia Air Conditioner, which means the system automatically reduced the compressor's operating frequency because the outdoor unit detected an instantaneous surge in compressor current (reaching its peak value), please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The filter of the indoor unit is blocked. Please clean the filter.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q42: What to do if C5 is displayed on the Mijia Air Conditioner?
A: If C5 is displayed on the Mijia Air Conditioner, which means the system automatically enters protection mode and reduces the compressor's operating frequency because the outdoor unit's electronic control drive module detects an abnormality or excessive load, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The filter of the indoor unit is blocked. Please clean the filter.
3. The heat dissipation is poor. Remove any obstructions from the outdoor unit to improve heat dissipation.
4. The airflow from the outdoor unit is not smooth. If the outdoor unit is placed inside a grille, the heat dissipation is poor. Please remove the grille.
5. The heat exchanger of the outdoor unit is dirty and blocked. Clean the heat exchanger and condenser if possible.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q43: What to do if P1 is displayed on the Mijia Air Conditioner?
A: If P1 is displayed on the Mijia Air Conditioner, which indicates the protection mechanism in the outdoor unit triggered by high temperature of the air emission, please refer to the following steps for troubleshooting:
1. When the air conditioner is operating in a high-temperature environment, the protection mechanism is for the safety of using the air conditioner. It will resume operation once the ambient temperature drops.
2. The filter of the indoor unit is dirty. Please clean the filter.
3. If the outdoor unit is placed inside a grille, which can cause poor heat exchange, please remove it from the grille.
4. If the heat exchanger of the outdoor unit is dirty and blocked, please clean the heat exchanger when convenient.
5. If the air outlet of the outdoor unit is blocked, which can cause poor ventilation, please remove any obstructions or adjust the installation place.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q44: What to do if P2.1 is displayed on the Mijia Air Conditioner?
A: If P2.1 is displayed on the Mijia Air Conditioner, which indicates the system automatically enters protection mode and reduces the compressor's operating frequency because the outdoor unit compressor exhaust temperature is too high, please refer to the following steps for troubleshooting:
1. When the air conditioner is operating in a high-temperature environment, the protection mechanism is for the safety of using the air conditioner. It will resume operation once the ambient temperature drops.
2. The filter of the indoor unit is dirty. Please clean the filter.
3. If the outdoor unit is placed inside a grille, which can cause poor heat exchange, please remove it from the grille.
4. If the heat exchanger of the outdoor unit is dirty and blocked, please clean the heat exchanger when convenient.
5. If the air outlet of the outdoor unit is blocked, which can cause poor ventilation, please remove any obstructions or adjust the installation place.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q45: What to do if P2.2 is displayed on the Mijia Air Conditioner?
A: If P2.2 is displayed on the Mijia Air Conditioner, which indicates the system automatically enters protection mode and reduces the compressor's operating frequency because the air conditioner detected that the evaporator temperature was too low, posing a risk of icing, please refer to the following steps for troubleshooting:
1. The filter of the indoor unit is dirty. Please clean the filter.
2. The air inlet of the indoor unit is blocked by foreign objects, such as a curtain and a newspaper. Please clear the objects blocked in the air inlet.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q46: What to do if P2.3 is displayed on the Mijia Air Conditioner?
A: If P2.3 is displayed on the Mijia Air Conditioner, it indicates the system automatically enters protection mode and reduces the compressor's operating frequency because the air conditioner detects that the indoor unit's evaporator temperature is too low or the humidity is too high. It is caused by excessive condensation when the air conditioner is operated at low speed due to high ambient humidity. It is a normal protection mechanism and can be resolved by closing doors and windows or adjusting the operation speed to high.
Q47: What to do if P2.4 is displayed on the Mijia Air Conditioner?
A: If P2.4 is displayed on the Mijia Air Conditioner, which indicates the system automatically enters protection mode and reduces the compressor's operating frequency because the air conditioner detected that the compressor or system power is too high, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The heat exchanger of the outdoor unit is blocked. Clean it when convenient.
3. If the outdoor unit is placed inside a grille, which can cause poor heat exchange, please remove it from the grille.
4. The filter of the indoor unit is blocked. Please clean the filter.
5. Check whether the air outlets of the indoor and outdoor units are blocked. If so, please remove any obstructions blocking the air outlets.
6. If the protection code appears in a high-temperature environment and the air conditioner is operated normally, it will disappear as the temperature drops.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q48: What to do if P2.5 is displayed on the Mijia Air Conditioner?
A: If P2.5 is displayed on the Mijia Air Conditioner, which indicates the system automatically enters protection mode and reduces the compressor's operating frequency because the air conditioner detected that the compressor or system load is too high, please refer to the following steps for troubleshooting:
In the cooling mode:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The heat exchanger of the outdoor unit is blocked. Clean it when convenient.
3. If the outdoor unit has poor airflow, please improve ventilation and heat dissipation (e.g., remove the grille).
In the heating mode:
1. Activating the heating function in a high-temperature environment is a normal safety precaution. If the heating effect is good, it indicates that the high outdoor temperature is triggering the protection mechanism, and you don't need to deal with it.
2. The filter of the indoor unit is blocked. Please clean the filter.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q49: What to do if P4 is displayed on the Mijia Air Conditioner?
A: If P4 is displayed on the Mijia Air Conditioner, which indicates the overheating protection in the heating mode, please refer to the following steps for troubleshooting:
1. Activating the heating function in a high-temperature environment is a normal safety precaution. If the heating effect is good, it indicates that the high outdoor temperature is triggering the protection mechanism, and you don't need to deal with it.
2. The filter of the indoor unit is blocked. Please clean the filter.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q50: What to do if P5 is displayed on the Mijia Air Conditioner?
A: If P5 is displayed on the Mijia Air Conditioner, which indicates the evaporator overcooling protection in the cooling mode, please refer to the following steps for troubleshooting:
1. The filter of the indoor unit is dirty. Please clean the filter.
2. The air inlet of the indoor unit is blocked by foreign objects, such as a curtain and a newspaper. Please clear the objects blocked in the air inlet.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q51: What to do if P6 is displayed on the Mijia Air Conditioner?
A: If P6 is displayed on the Mijia Air Conditioner, which indicates the overheating protection for cooling mode, please refer to the following steps for troubleshooting:
1. The voltage is unstable. Wait for the voltage to stabilize before restarting. If the voltage remains unstable for an extended period, install a voltage regulator.
2. The heat exchanger of the outdoor unit is dirty and blocked. Clean it when convenient.
3. If the outdoor unit has poor airflow, please improve ventilation and heat dissipation (e.g., remove the grille).
If this case persists, it is recommended that you apply for the after-sales inspection.
Q52: What to do if P7 is displayed on the Mijia Air Conditioner?
A: If P7 is displayed on the Mijia Air Conditioner, it indicates the module temperature protection, which is caused by problems with the mainboard of the outdoor unit, etc. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q53: What to do if P8 is displayed on the Mijia Air Conditioner?
A: If P8 is displayed on the Mijia Air Conditioner, which indicates the overheating and underheat protection of the outdoor unit, please refer to the following steps for troubleshooting:
1. Check whether the ambient temperature of the outdoor unit is normal when starting cooling or heating. If the ambient temperature is too high or too low, this is normal protection (cooling exceeding 18 ℃-43 ℃; heating exceeding -7 ℃-24 ℃). An error will occur if the cooling or heating temperature exceeds the protection range.
2. The outdoor unit is installed in a confined, enclosed space, leading to poor heat dissipation and causing the ambient temperature around the outdoor unit to be too high or too low. The outdoor unit needs to be placed in a well-ventilated location.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q54: What to do if P9 is displayed on the Mijia Air Conditioner?
A: If P9 is displayed on the Mijia Air Conditioner, which indicates that the system is malfunctioning, please refer to the following steps for troubleshooting:
1. Only in an excessively high temperature environment can this code appear.
2. Check whether the condenser and the evaporator are dirty and blocked, and clean them when convenient.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q55: What to do if PA is displayed on the Mijia Air Conditioner?
A: If PA is displayed on the Mijia Air Conditioner, it indicates the fluoride deficiency protection/abnormal refrigerant cycle protection. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q56: What to do if PC is displayed on the Mijia Air Conditioner?
A: If PC is displayed on the Mijia Air Conditioner, it indicates the four-way valve is not switching properly. You can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q57: What to do if PD is displayed on the Mijia Air Conditioner?
A: If PD is displayed on the Mijia Air Conditioner, which indicates the high-pressure protection, please refer to the following steps for troubleshooting:
1. Check whether the airflow of the outdoor unit is smooth and whether the air outlet is blocked, and remove any obstructions blocking the outdoor unit.
2. Check whether the outdoor unit is placed inside a grille, which can cause poor heat exchange, and remove the grille.
If this case persists, it is recommended that you apply for the after-sales inspection.
Q58: What to do if PE is displayed on the Mijia Air Conditioner?
A: If PE is displayed on the Mijia Air Conditioner, which indicates the low-pressure protection, you can try powering off the air conditioner for 3 to 5 minutes and restarting it to check whether it resumes. If this case persists, it is recommended that you apply for the after-sales inspection.
Q59: What to do if FRc is displayed on the Mijia Air Conditioner?
A: If FRc is displayed on the Mijia Air Conditioner, it indicates the air conditioner is in the factory test mode. Please power off the remote control and the air conditioner, and power them on after 2 minutes to solve it.
Q60: What to do if H5 (HS) is displayed on the Mijia Air Conditioner?
A: If H5 (HS) is displayed on the Mijia Air Conditioner, it indicates that the air conditioner is in the defrosting process, which is normal in the heating mode. When the defrosting process ends, the operation of the air conditioner will resume. If this case persists, it is recommended that you apply for the after-sales inspection.
Q61: What to do if P3 is displayed on the Mijia Air Conditioner?
A: If P3 is displayed on the Mijia Air Conditioner, it indicates that the air conditioner is in the defrosting process, which is normal in the heating mode. When the defrosting process ends, the operation of the air conditioner will resume.
Does it help?
Yes
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