DC Inverter Air
Testpower
supplycurrent
YES
Test current
transducers
YES
Replace main control panel
NO
in nameplate
NO
Use method of exclusion
without load
Transducer current shall be
less than the value in nameplate
Check whether the power supply
complies with the applicable scope
of equipment
Check system pressure,
compressor load, etc.
Replace damaged load
P21: Low Pressure Protection of the System
Treatment Method:
1. Test whether the system pressure is normal;
2. Disconnect the pressure switch and use multi‐meter 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 low pressure protections occur within one hour, the protection will be changed into the fault code (E35)
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.
P31: 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.
P33: Outdoor Ambient Over‐temperature/under‐temperature (T4 or TAMB)
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℃
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