Daikin R42NUY2S - Page 387

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