U4" Malfunction Of Transmission Between Indoor Units And Outdoor Units - Daikin VRV III-S RXYMQ6PV4A Service Manual

Troubleshooting by Indication on the Remote Controller
3.41 "U4"
Malfunction of Transmission between Indoor Units
and Outdoor Units
U4
Remote
Controller
Display
Applicable AII indoor unit models
RXYMQ6P
Models
Method of Microcomputer checks if transmission between indoor and outdoor units is normal.
Malfunction
Detection
Malfunction When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
176
Indoor to outdoor, outdoor to outdoor transmission wiring F1, F2 disconnection, short circuit
or wrong wiring
Outdoor unit power supply is OFF
System address doesn't match
Defect of outdoor unit PC board
Defect of indoor unit PC board
SiME34-608
Troubleshooting