U7 " Outdoor Unit: Transmission Failure (Across Outdoor Units) - Daikin RQYQ140-180PY1 Service Manual

Troubleshooting by Remote Controller
U7
2.34 " " Outdoor Unit: Transmission Failure (Across
Outdoor Units)
U7
Remote
Controller
Display
Applicable RQYQ-PY1
RQEQ-PY1
Models
Method of Micro-computer checks if transmission between outdoor units is normal.
Malfunction
Detection
Malfunction When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
165
Connection error in connecting wires between outdoor unit and external control adaptor for
outdoor unit
Connection error in connecting wires across outdoor units
Setting error in switching cooling/ heating
Unified address setting error for cooling/ heating
(function unit, external control adaptor for outdoor unit)
Defective outdoor unit PCB (A1P)
Defective of external control adaptor for outdoor unit
SiBE341001
Troubleshooting