Carrier 38GVM Series, Service Manual, Page: 34 / 70

34
TROUBLESHOOTING CONTINUED
Energize the unit
If any of these causes exist
yes
no
no
no
no
no
yes
yes
yes
yes
Check the compressor windings
to ground
Malfunction is eliminated
End
Is the compressor wiring connected?
Correct according to the service
manual and then recharge the
system
Test the resistance of the
compressor windings
Reconnect the compressor
wiring according to the
wiring diagram
Is the resistance is normal?
Is the resistance is above 500M ?
Replace the
compressor
Replace the outdoor
mainboard
Please check:
1. if the indoor or outdoor heat exchangers are
dirty, if there is blockage to affect the airflow;
2. if the indoor and outdoor fans are running
normally;
3. if the system pressure is too high;
4. if the system is overcharged;