Daikin Sky Air R-407C Service Manual page 289

ESIE02–01
Troubleshooting 2 To troubleshoot, proceed as follows:
Check of
outdoor unit
microcom-
puter normal
HAP
Part 3 – Troubleshooting
Continued from
previous page
NO (ON or OFF)
Is HAP flashing?
Turn the power supply off
YES
once and then back on.
Turn off the power
supply, disconnect the
NO.2 indoor-outdoor
transmission wire, and turn
power supply back on.
YES
"U4" displays
constantly?
NO
Error Codes: System Malfunctions
YES
Is HAP flashing?
NO
YES
Is HAP on?
NO (OFF)
YES
Is HAP flashing?
NO
Resets normally.
Could be outside cause
(noise...).
Failure of outdoor unit PCB.
Failure of indoor unit PCB.
Failure of outdoor unit PCB or
malfunction of power supply
system.
Indoor PCB malfunction.
Resets normally.
Could be outside cause (noise...).
1
3 3
4
5
3–59