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1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF.
Check the resistance between each terminal.
Is HPS protection displayed immediately after
compressor starts?
Replace HPS.
Replace the outdoor electronic
control P.C. board.
Normal
Infi nity
No
0 Ω
Yes
The operation frequency does not go up from lowest frequency.
Reconnect CN681.
Turn ON power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
I Check of HPS