Daikin RXQ12AHR Service Manual page 250

Troubleshooting by Error Code
 Subcode L4-06, 07, 18, 19, 20, 21
244
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the cooling conditions
of the inverter heat sink.
(1) Is the insulation sheet
(blue) properly fixed?
(2) Is the heat sink properly
fixed with screws?
(3) Error code U0 is displayed
on the Error History screen.
Normal?
YES
Turn
ON the power
supply. Does the error
recur when operation
starts?
NO
NO
YES
SiAF341904E
Rectify troubles.
Replace the fan PCB.
RXQ6-12A: A4P
RXQ14-20A: A4P, A7P
Continue operation.
Field factor. Heat sink radiation fin
temperature may have risen due to
high outdoor air temperature.
Part 6 Service Diagnosis