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