DC Inverter Air
replace the main control panel (MCP).
E05: open/short‐circuit fault of outdoor ambient temperature sensor (TABM,T1)
Treatment Method:
Sensor Fault
Use the resistor gear of multi‐meter to measure the resistance of sensor
to check whether it corresponds to that of temperature sensor in attached
Replace sensor
Use the resistor gear of multi‐meter to measure the pull down
Check MCP
resistance of circuit sensor interface, usually 8.1‐10K.
Use the DC voltage gear to measure the voltage of sensor sampling port
of IC under the standby state, usually 3V or so
Replace MCB
Use the resistor gear of multi‐meter to measure the resistance of sensor to check whether it is corresponding to that of
temperature sensor in attached page
Use the resistor gear of multi‐meter to measure the pull down resistance of circuit sensor interface, usually 8.1‐10K. Use the
DC voltage gear to measure the voltage of sensor sampling port of IC under the standby state, usually 3V or so
E06: open/short‐circuit fault of outdoor condenser central temperature sensor (TC)
The treatment method is the same as E05.
E07: open/short‐circuit fault of outdoor condenser defrosting temperature sensor (T3 OR OPT)
The treatment method is the same as E05.
E12: open/short‐circuit fault of outdoor suction temperature sensor (TX or T5)
The treatment method is the same as E05.
E13: open/short‐circuit fault of compressor exhaust temperature sensor (TD)
The treatment method is the same as E05.
E21: commutation failure of four‐way valve (heating mode)
Treatment Method:
1. Under the heating mode, use the multi‐meter to test the voltage of four‐way valve output
terminal of outdoor main control panel (31), usually within 165‐270V;
2. If the voltage is normal, it indicates the commutation failure of four‐way valve. It is necessary to
check or replace the four‐way valve;
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