Transmission Error Between Indoor Units And Condensing Units - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
3.41 Transmission Error between Indoor Units and Condensing
Units
U4
Error Code
Applicable
All indoor models
Models RWEYQ72P, 84P
Method of Error
Micro-computer checks if transmission between indoor and condensing units is normal.
Detection
Error Decision When transmission is not carried out normally for a certain amount of time
Conditions
 Indoor to condensing, condensing to condensing transmission wiring F1, F2 disconnection,
Supposed
Causes
 Condensing unit power supply is OFF
 System address does not match
 Defective condensing unit main PCB
 Defective indoor unit PCB
Service Diagnosis
short circuit or wrong wiring
Troubleshooting by Indication on the Remote Controller
219