Daikin R71FUV1 Service Manual page 387

Si20-701_B
A
Check of
outdoor unit
micro-computer normal
HAP. Is HAP
blinking?
YES
"U4" displays
constantly?
NO
380
Troubleshooting by Remote Controller
NO (ON or OFF)
Turn OFF the power
supply and turn the power
ON.
Is HAP blinking?
NO
Is HAP ON?
NO (OFF)
Turn OFF the power
supply, disconnect the
No.2 indoor-outdoor
transmission wire, and
turn power supply restart.
Is HAP blinking?
NO
YES
YES
External factor
(Noise, etc.).
YES
Failure of
outdoor unit
PCB.
YES
Replace the
indoor unit PCB.
Replace the
outdoor unit PCB
or correct power
supply system
Replace the
indoor unit PCB
Resets normally.
External factor
(Noise, etc.)