SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 273
5.44.2 Compressor Instantaneous Overcurrent (6/8 HP Models)
Applicable
Models
RXMQ6/8AR
Error Code L5
Method of Error
Detection
Detect current flowing through the power transistor.
Error Decision
Conditions
The current instantaneously exceeds A (A) in the power transistor.
Trigger point
Supposed
Causes
Defective compressor coil (such as wiring disconnection or insulation failure)
Compressor startup failure (mechanical lock)
Defective outdoor unit main PCB (RXMQ6AR)
Defective inverter PCB (RXMQ8AR)
Troubleshooting
Compressor model A (A)
2Y350APAX2N 48.1
2Y420AVAY1N 48.55
Power OFF
Open the stop valve.
YES
NO
Is the stop valve open?
YES
YES
Are
wiring and wire
connections to the
compressor
normal?
Rectify the wiring and
wire connections.
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check for the leads of the
compressor.
• For compressor M1C
Are the
leads of the
compressor normal?
Replace the leads of the
compressor.
NO
A
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