Inverter Radiation Fin Temperature Rise Abnormality - Daikin RXQ12AHR Service Manual

SiAF341904E

5.38 Inverter Radiation Fin Temperature Rise Abnormality

Applicable All outdoor unit models
Models
L4
Error Code
Method of Error Detect temperature of power module of the inverter PCB and fan PCB.
Detection
Error Decision
Thermistor located inside the power module of the inverter PCB for compressor and fan motor.
Conditions Cooling tube plate poor heat-exchange.
Supposed
 Radiation fin temperature rise of fan PCB.
Causes  Cooling tube plate not fixed with screws.
 U0 error.
 Defective inverter PCB.
 High outdoor air temperature.
Troubleshooting  Subcode L4-01, 02, 03, 09, 10, 11
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check in Monitor Mode
For the models equipped with
2 compressors, check the
compressor M1C or M2C
applicable to the error code
L4 while in monitor mode of
the outdoor unit.
Check for the cooling
conditions of cooling tube
used to cool the inverter.
(1) Is the cooling tube plate
fixed with screws?
(2) Error code U0 is displayed
on the Error History
screen.
Normal?
YES
Turn ON the
power supply, and then
press the ON button
continuously. Does
the error
recur?
NO
NO
YES
Troubleshooting by Error Code
Rectify troubles.
Replace the inverter PCB.
RXQ6-14A: A3P
RXQ16-20A: A3P, A6P
Continue operation.
Field factor. Power module temperature
may have risen due to high outdoor air
temperature.
243