SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 271
5.43.3 Radiation Fin Temperature Rise Abnormality (10/12 HP Models)
Applicable
Models
RXMQ10/12AR
Error Code L4
Method of Error
Detection
Use the thermistor to test the radiation fin temperature of the inverter PCB of the compressor.
Error Decision
Conditions
Error is determined when the PCB circuit thermistor detects a temperature higher than the
designed temperature.
Supposed
Causes
Insulation sheet (pale blue) does not cover the entire radiator.
Radiation fin is not fixed with fixing screws.
U0 error
Defective inverter PCB
Outdoor temperature too high
Troubleshooting
NO
Is it normal?
Resolve the error.
YES
YES
NO
Replace the inverter PCB (A3P).
Keep operating.
Possibly related to on-site causes
such as increased radiating plate
temperature due to high outdoor
temperature.
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?
Does an
error occur after
connecting to the power and
starting operation?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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