Si20-701_B Troubleshooting by Remote Controller
388
Remote Controller Display
U4
Applicable Models
FMCQ, FMDQ-A7/B7
CMSQ
Method of Error Detection
Micro-computer checks if transmission between indoor
and outdoor units is normal.
Error Decision Conditions
When transmission is not carried out normally for a
certain amount of time
Supposed Causes
îš„ Indoor to outdoor, outdoor to outdoor transmission
wiring F1, F2 disconnection, short circuit or wrong
wiring
îš„ Outdoor unit power supply is OFF
îš„ System address does not match
îš„ Defective indoor unit PCB
îš„ Defective outdoor unit PCB
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