Gree IWZA Service Manual page 22

No
Replace overload
protector SAT
70
H3 or E4 is displayed
30min after power off the unit
If the overload protector SAT
is well connected?
Yes
Under ambient temperature,
test the resistance of overload protector with ohmmeter;
resistance value should be＜1000ohm
Yes
If the wiring terminal FA of electronic
expansion valve is well connected?
Yes
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
No
Connect wire
according to wiring
No
diagram
Is the malfunction
eliminated?
No
Is the malfunction
eliminated?
No
Is the malfunction
eliminated?
No
Is the malfunction
eliminated?
No
Is the malfunction
eliminated?
No
Replace outdoor
mainboard AP1
End
Service Manual
Yes
Y
Yes
Y
Yes
Y
Yes
Y
Yes
Installation and Maintenance