DC Inverter Air
P03: Inside Function Protection of Inverter Module (see Compressor Driver Fault and Protection Codes for
details)
Treatment Method:
1. Whether the module communication line is reliably connected with the communication interface
of main control panel;
2. Whether the module DC power supply is 310V or so for single phase (530V for three phases);
3. Whether it can be normally started after cutting off the input connecting line of the compressor. If
it can be normally started, it indicates the compressor is damaged (the resistance of three
terminal blocks of compressor is about 5 ohms) and if it cannot be normally started, it indicates
the module is damaged.
P04: 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.
P09: Inverter Compressor Exhaust High Temperature Protection (TD)
Treatment Method:
1. Test whether the compressor exhaust temperature is normal (below 115°);
2. If it is normal, please test whether the resistance of exhaust temperature sensor is consistent
with that in attached page (Annex 4);
If three compressor exhaust high temperature protections occur within one hour, the protection will be
changed into the fault code (E13) 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.
P12: Condenser High Temperature Protection (TC)
Treatment Method:
1. Test whether the condenser temperature is normal (below 62°);
2. If it is normal, please test whether the resistance of exhaust temperature sensor is consistent
with that in attached page (Annex 3);
If three condenser high temperature protections occur within one hour, the protection will be changed into
the fault code (E06) 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.
P13: Shutdown when inverter compressor current is greater than the protection current
Treatment Method:
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