U7" Outdoor Unit: Transmission Failure (Across Outdoor Units) - Daikin RTSQ20PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
U7
4.50 " " Outdoor Unit: Transmission Failure (Across
Outdoor Units)
U7
Remote
Controller
Display
Applicable All models of outdoor units and function unit
Models
Method of Micro-computer checks if transmission between outdoor units.
Malfunction
Detection
Malfunction When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
303
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
Integrated address setting error for cooling/ heating
(function unit, external control adaptor for outdoor unit)
Defective outdoor unit PCB (A1P or A3P)
Defective external control adaptor for outdoor unit
SiBE31-801_C
Troubleshooting