Gree TERRA09HP230V1A Installation, Service & Troubleshooting page 93

U1, U3, U5, U7, U9 Error Codes
U1
Compressor Phase Detection Error
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
U3
U5
U7
U9
Zero crossing, malfunction of Outdoor Unit
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Error Code Diagnostics
Fault & Status
DC Bus-Bar Voltage Unstable
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Circuit Board Malfunction on Outdoor Unit
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Reversing Valve Malfunction
Status:
During heating mode, complete unit will stop
Possible Causes
1. Replace outdoor control panel AP1
1. Supply voltage is unstable
1. Replace outdoor control panel AP1
1. Supply voltage is too low
2. Wiring terminal on reversing valve is loose or
broken
3. Replace reversing valve
1. Replace outdoor control panel AP1
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