DC Inverter Air
If three compressor exhaust high temperature protections occur within one hour, the protection will be
changed into the fault code (E8) and then the system will automatically shut down and be locked, and it is
required to switch off and re‐energize to resume the operation.
P3: High Pressure Protection of the System
Treatment Method:
1. Test whether the system pressure is normal;
2. Disconnect the pressure switch and use multimeter to test whether the two terminals of
pressure switch are short‐circuit;
3. If the pressure switch and system pressure are both normal, please replace the main
control panel;
If three high pressure protections occur within one hour, the protection will be changed into the fault code
(E34) and then the system will automatically shut down and be locked, and it is required to switch off and re‐
energize to resume the operation.
E2: Coil Temperature (T2) Protection of Indoor Unit
Treatment Method:
1. Test whether the indoor evaporator temperature is normal;
2. If it is normal, please test whether the resistance of exhaust temperature sensor is
consistent with that in attached page (Annex 3);
3. If it is normal, please replace the main control panel.
If three indoor coil (T2) protections (excluding evaporator low temperature protection) occur within one hour,
the protection will be changed into the fault code (E33) and then the system will automatically shut down and
be locked, and it is required to switch off and re‐energize to resume the operation.
E4: Outdoor Ambient Over‐temperature/under‐temperature (T4 ） Protection
Treatment Method:
1. Test whether the ambient temperature of outdoor unit is in the running
range: Cooling: ‐15℃≤T4≤48℃
Heating: ‐15℃≤T4≤27℃
2. If it is normal, please test whether the resistance of exhaust temperature sensor is
consistent with that in attached page (Annex 3);
3. If it is normal, please replace the main control panel.
E9: Driver Radiator Temperature Protection of Outdoor
Unit Treatment Method:
1. Test whether the driver radiator temperature is normal (below 80°);
2. If it is normal, please test whether the resistance of driver radiator temperature is
consistent with that in attached page (Annex 3);
3. If it is normal, please replace the main control panel.
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