Si20-701_B Troubleshooting by Remote Controller
456
3.109
UH
System Error, Refrigerant
System Address Undefined
Remote Controller Display
UH
Applicable Models
FMCQ, FMDQ-A7/B7
Method of Error Detection
Detect an indoor unit with no address setting.
Error Decision Conditions
The error decision is made as soon as the abnormality
aforementioned is detected.
Supposed Causes
Improper connection of transmission wiring between
indoor-outdoor units and outdoor-outdoor units
Defective indoor unit PCB
Defective outdoor unit PCB (A1P)
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