Daikin R71FUV1 Service Manual page 395

Si20-701_B
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
Indoor to outdoor, outdoor to outdoor transmission
wiring F1, F2 disconnection, short circuit or wrong
wiring
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
388
Troubleshooting by Remote Controller