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

Troubleshooting by Indication on the Remote Controller

3.43 Transmission Error between Condensing Units

U7
Error Code
Applicable
RWEYQ72P, 84P
Models
Method of Error Micro-computer checks if transmission between condensing units is normal.
Detection
Error Decision
When transmission is not carried out normally for a certain amount of time
Conditions
 Improper connection of transmission wiring between condensing unit and external control
Supposed
Causes
 Improper connection of transmission wiring between condensing units
 Improper cool/heat selection
 Improper cool/heat unified address (condensing unit, external control adaptor for condensing
 Defective condensing unit PCB (A1P)
 Defective external control adaptor for condensing unit
 Defective fuse of condensing unit compressor
222
adaptor for condensing unit.
unit)
SiUS30-1301
Service Diagnosis