Troubleshooting by Error Code SiAF332111E
278 Part 6 Service Diagnosis
5.46 Compressor Startup Abnormality
5.46.1 Compressor Startup Abnormality (4/5 HP Models)
Applicable
Models
RXQ4/5AR
Error Code L9
Method of Error
Detection
Error is detected by the power transistor current.
Error Decision
Conditions
Compressor overload during activation
Supposed
Causes
Defective compressor
Large pressure difference before starting the compressor
Defective outdoor unit main PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
NO
NO
YES
YES
YES
Does L9 blink after
reconnecting to the power?
When
operation starts, is the high
and low pressure difference greater
than 0.2 MPa?
Unbalanced
inverter output voltage (±5 V
is normal). After stabilizing the inverter,
is the inverter output pressure
measurable?
Disconnect the compressor from the
inverter. Use power transistor to check
codes based on maintenance codes.
Nonconforming pressure
balance. Check the
refrigerant system.
Replace the outdoor unit
main PCB (A1P).
Reset and then restart
the unit.
Check the compressor according to
diagnosis procedure for compressor
abnormal noises/vibrations and
operation conditions.
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