Malfunction Checking And Elimination; Ipm Protection Malfunction; Main Checking Point - Gree GWHD14NK3BO Service Manual

Troubleshooting
43 Communication failure with Unit A
44 Communication failure with Unit B
45 Communication failure with Unit C
46 Communication failure with Unit D
47 Unit A freeze protection
48 Unit B freeze protection
49 Unit C freeze protection
50 Unit D freeze protection
overheating prevention protection
51 Unit A
overheating prevention protection
52 Unit B
overheating prevention protection
53 Unit C
overheating prevention protection
54 Unit D
55 Unit A communication wire misconnection or expansion valve malfunction
56 Unit B communication wire misconnection or expansion valve malfunction
57 Unit C communication wire misconnection or expansion valve malfunction
58 Unit D communication wire misconnection or expansion valve malfunction

9.2 Malfunction Checking and Elimination

Note: discharge the position in below pictures with discharge resistance after open the top cover and
check if the voltage is below 20V with universal meter, then begin to check.
14/18K:

(1) IPM protection malfunction:

Main checking point:

If the input voltage of the unit is within normal range?
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
If the unit is overloaded? If the heat radiation of the unit is good?
If the refrigerant charge is suitable?
Flow chart:
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24/28K:
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