Carrier 38GVM Series Service Manual

Also see for 38GVM Series: Installation instructions

Contents

Carrier 38GVM Series Service Manual Manual pdf 33 page image

33TROUBLESHOOTING CONTINUED43 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 ● ●51 Unit A overheating prevention protection ○ ●52 Unit B overheating prevention protection ● ●53 Unit C overheating prevention protection ●54 Unit D overheating prevention protection ○ ○ ○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 ● ● ○Malfunction Checking and EliminationNOTE: Discharge power capacities at positions shown below. Voltage should be less than 20v (measured with a meter) prior to initiatingservice work.18k 24/30k(1) IPM protection malfunction:Main checking point:S Is the input voltage of the unit within the acceptable range?S Is the compressor connected correctly?S Is the compressor winding resistance correct?S Are the heat exchangers clean / unblocked?S Is the refrigerant charge correct?Flow chart: