Inventor Air Conditioner Error Codes An error code or flashing light popping up on any electrical equipment or their attendant remote can be a bit of a worry. These warnings speak for the system; telling users that a problem exists with either the inside or the outside unit. Generally when an error occurs the unit will shut itself off to prevent further damage.
Inventor Air Conditioner Error Code Solutions
Each error code has a meaning, which will allow users to understand what the problem is and thereby what needs to be done to fix it.
| Code Display | Malfunction Name |
|---|---|
| E1 | High pressure protection of system |
| E2 | Antifreezing protection |
| E3 | System block or refrigerant leakage |
| E4 | High discharge temperature protection of compressor |
| E5 | Overcurrent protection |
| E6 | Communication Malfunction |
| E8 | High temperature resistant protection |
| EE | EEPROM malfunction |
| EU | Limit/ decrease frequency due to high temperature of module |
| C5 | Malfunction protection of jumper cap |
| Fo | Gathering refrigerant |
| F1 | Indoor ambient temperature sensor is open/short circuited |
| F2 | Indoor evaporator temperature sensor is open/short circuited |
| F3 | Outdoor ambient temperature sensor is open/short circuited |
| F4 | Outdoor condenser temperature sensor is open/short circuited |
| F5 | Outdoor discharge temperature sensor is open/short circuited |
| F6 | Limit/ decrease frequency due to overload |
| F8 | Decrease frequency due to overcurrent |
| F9 | Decrease frequency due to high air discharge |
| FH | Limit/ decrease frequency due to antifreezing |
| PH | Voltage for DC bus-bar is too high |
| PL | Voltage of DC bus-bar is too low |
| P0 | Compressor Min frequence in test state |
| P1 | Compressor rated frequence in test state |
| P2 | Compressor maximum frequence in test state |
| P3 | Compressor intermediate frequence in test state |
| P5 | Overcurrent protection of phase current for compressor |
| PU | Charging malfunction of capacitor |
| P7 | Malfunction of module temperature sensor circuit |
| P8 | Module high temperature protection |
| H0 | Decrease frequency due to high temperature resistant during heating operation |
| H2 | Static dedusting protection |
| H3 | Overload protection for compressor |
| H4 | System is abnormal |
| H5 | IPM protection |
| H5 | Module temperature is too high |
| H6 | Internal motor (fan motor) do not operate |
| H7 | Desynchronizing of compressor |
| HC | PFC protection |
| L3 | Outdoor DC fan motor malfunction |
| L9 | Power protection |
| LP | Indoor unit and outdoor unit doesn’t match |
| LC | Failure startup |
| U1 | Malfunction of phase current detection circuit for compressor |
| U3 | Malfunction of voltage dropping for DC bus-bar |
| U5 | Malfunction of complete units current detection |
| U7 | The four-way valve is abnormal |
| U9 | Zerocrossing malfunction of outdoor unit |
| U8 | Zero-crossing inspection circuit malfunction of the IDU fan motor |
Analysis or processing of some of the malfunction display:
- Compressor discharge protection
Possible causes: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short pass for condenser; the system has noncondensing gas (such as air, water etc.); blockage of capillary assy (including filter); leakage inside four-way valve causes incorrect operation; malfunction of compressor; malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too high. Processing method: refer to the malfunction analysis in the above section.
- Low voltage overcurrent protection
Possi ble cause: Sudden drop of supply voltage.
- Communication malfunction
Processing method: Check if communication signal cable is connected reliably.
- Sensor open or short circuit
Processing method: Check whether sensor is normal, connected with the corre sponding position on the controller and if damage of lead wire is found.
- Compressor over load protection
Possible causes: insufficient or too much refrigrant; blockage of capillary and increase of suction temp.; improper running of compressor, burning in or stuck of bearing, damage of discharge valve; malfunction of protector. Processing method: adjust refrigerant amount; replace the capillary; replace the compressor; use universal meter to check if the contactor of compress or is fine when it is not overheated, if not replace the protector.
- System malfunction
i.e.overload protection.When tube temperature(Check the temperature of outdoor heat exchanger when cooling and check the temperatur e of indoor heat exchanger when heating) is too high, protectionwill beactivated. Possi ble causes: Outdoor temperature is too high when cooling; insufficient outdoor air circulation; refrigerant flow malfunction. please refer to the malfunction analysis in the previous section for handling method .
- IPM module protection
Processing method:Once the module malfunction happens,if it persists for a long time and can not be selfcanceled, cut off the power and turn off the unit,and then re-energize the unit again after about 10 min.After repeating the procedure for sever times, if the malfunction still exists,replace the module.