79
Installation and Maintenance
Service Manual
Yes
Y
Y
Y
Y
H3 or E4 is displayed
30min after power off the unit
If the overload protector SAT
is well connected?
Under ambient temperature,
test the resistance of overload protector with ohmmeter;
resistance value should be＜1000ohm
If the wiring terminal FA of electronic
expansion valve is well connected?
Replace EKV coil of electronic expansion valve
Check the situation of refrigerant; if there is leakage,
please charge refrigerant according to the service
manual
Compressor overload protection terminal is not
connected well with the mainboard; reconnect
them correctly
Heat exchange of unit is not good (heat exchanger
is dirty and unit radiating environment is bad);
improve the radiating environment and clean the
heat exchanger
Too much load of the system causes high temperature
of compressor after working for a long time;
decrease the load for operation
Is the malfunction
eliminated?
Is the malfunction
eliminated?
Is the malfunction
eliminated?
Is the malfunction
eliminated?
Is the malfunction
eliminated?
Replace outdoor
mainboard AP1
End
Replace overload
protector SAT
Connect wire
according to wiring
diagram
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
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