Daikin F701

Alarm Logic	F701 Main power supply voltage error Main power is greater than 535V or less than 300V when start within 2 seconds If phase (in-phase or reverse-phase) is unknown If main power frequency is greater than or equal to 70Hz, or less than equal to 40Hz
Possible Causes	Main power is greater than 535V or less than 300V Faulty voltage detection : Connector disconnected / Faulty PT on PT/CT board (other than disconnection and short circuit) / S phase is open Main power frequency is greater than or equal to 70Hz, or less than equal to 40Hz

Trouble Shooting	1. Main power check Check if the main power supply remains in allowable range (300V-535V)	1. Supply power is in range Damage to parts may accrue
	2-1. R,S,T phase missing check Check if there is a missing phase on the power side of circuit breaker 2-2. Check if there is a broken wire (open) on the secondary side of circuit breaker Between C/B and CN2 (PT/CT board) Between C/B and Tr1 and CN1 (I/O board)	2-1. Replace or repair if there is problem in power plug or cable 2-2. If a phase is missing repair as needed Repair if there is a broken wire (open) on the secondary side of circuit breaker

Controller Action	F701 Unit stopped