Troubleshooting by Error Code SiAF332111E
276 Part 6 Service Diagnosis
5.45.2 Compressor Overcurrent (6/8 HP Models)
Applicable
Models
RXMQ6/8AR
Error Code L8
Method of Error
Detection
Detect current flowing through the power transistor.
Error Decision
Conditions
(1) The secondary-side inverter current exceeds A (A) for a period of 5 consecutive seconds.
(2) The secondary-side inverter current exceeds B (A) for a period of 260 consecutive seconds.
Trigger point
Supposed
Causes
Compressor overloaded
Wiring disconnection in compressor coil
Disconnection of compressor wiring
Defective outdoor unit main PCB (RXMQ6AR)
Defective inverter PCB (RXMQ8AR)
Troubleshooting
Compressor model A (A) B (A)
2Y350APAX2N 22.1 22.1
2Y420AVAY1N 22.5 18.6
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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