Troubleshooting by Error Code SiAF332111E
256 Part 6 Service Diagnosis
5.34 Harness Abnormality (between Outdoor Unit Main PCB
and Inverter PCB)
Applicable
Models
RXMQ8-12AR
Error Code H3
Method of Error
Detection
Check for the transmission conditions of the harnesses between the PCBs (X28A (A1P) and
X6A (A3P)), and relay connector, if any, using microcomputer.
Error Decision
Conditions
When normal transmission between PCBs is disabled during the compressor stops running.
Supposed
Causes
Defective connection of harnesses between PCBs
Defective outdoor unit main PCB
Defective inverter PCB
Troubleshooting
1. A3P
Check for the transmission
conditions of the jumpers
between the PCBs.
Replace the outdoor unit main
PCB.
Replace the inverter PCB. (1)
YES
NO
YES
Complete countermeasures.
Return the relevant harness to
normal.
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Harness error
H3 error recurs.
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