157
H7
Error Code Diagnostics
H7 Error Code, continued
Start Troubleshooting
Is the outdoor fan working
properly?
Yes
Are wire connections
proper?
Is input voltage normal?
No
Are there any airflow obstructions?
No
End Troubleshooting
Desynchronizing of compressor
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
1. Check the resistance of the compressor
terminals and connections to the compressor
2. Check for overcharge of refrigerant
3. Check for correct voltage
Troubleshooting Procedure for Synchronizing Fault During Operation
Yes
Wire per diagram.
Replace Fan
Capacitor C1
Yes
Fan Operating
Properly?
Yes
Replace Outdoor Fan
Motor?
Yes
Improve airflow
Yes
No
Is unit overcharged?
Replace Control Board
AP1
Correct voltage
problem
No
Charge per
installation manual
Malfunction corrected
Yes
Replace Compressor
No