Daikin F705

Alarm Logic	F705 S phase is open
Possible Causes	Power supply voltage abnormal : S phase is open / Main power supply is faulty Faulty power supply equipment : Faulty power plug contacts / Power cable contact faulty / Faulty PT/CT board

Trouble Shooting	1. Check if there is phase missing on power supply equipment side	1. Provide correct power supply if there is a power phase missing.
	2. Check if there is a broken wire (open) in power plug or power cable on the power side of circuit breaker	2. Repair as needed.
	3. Check for broken wire (open) on the secondary side of circuit breaker Between C/B and CN2 on PT/CT board (EC5) Between C/B and Tr1 and CN1 on I/O board (EC2)	3. Repair as needed

Controller Action	F705 Unit stopped