Specifications

SiBE341027 Troubleshooting by Remote Controller
Service Diagnosis 177
2.42 System Error, Refrigerant System Address Undefined
Remote
Controller
Display
UH
Applicable
Models
All models of indoor unit
RQYQ-PY1B
Method of Error
Detection
Detect an indoor unit with no auto 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 main PCB