Daikin VRV S RXQ4/5ARV1 Service Manual page 277

SiAF332111E
5.43.3 Radiation Fin Temperature Rise Abnormality (10/12 HP Models)
Applicable
RXMQ10/12AR
Models
L4
Error Code
Method of Error Use the thermistor to test the radiation fin temperature of the inverter PCB of the compressor.
Detection
Error Decision
Error is determined when the PCB circuit thermistor detects a temperature higher than the
Conditions designed temperature.
Supposed
 Insulation sheet (pale blue) does not cover the entire radiator.
Causes  Radiation fin is not fixed with fixing screws.
 U0 error
 Defective inverter PCB
 Outdoor temperature too high
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the cooling condition of the radiation fin
for inverter cooling.
(1) Is the radiation fin well covered by the
insulating sheet (pale blue)?
(2) Is the radiation fin fixed by fixing screws?
(3) Does the error history display the error code
U0?
Is it normal?
YES
Does an
error occur after
connecting to the power and
starting operation?
NO
Troubleshooting by Error Code
NO
Resolve the error.
YES
Replace the inverter PCB (A3P).
Keep operating.
Possibly related to on-site causes
such as increased radiating plate
temperature due to high outdoor
temperature.
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