U4 Transmission Error Between Indoor Units And Outdoor Units - Daikin VRVII Manual

Troubleshooting by Indication on the Remote Controller
U4
3.62
between Indoor Units and
Outdoor Units
Remote Controller Display
U4
Applicable Models
All indoor models
VRVIII Series
Method of Error Detection
Micro-computer checks if transmission between indoor
and outdoor units is normal.
Error Decision Conditions
When transmission is not carried out normally for a
certain amount of time
Supposed Causes
Indoor to outdoor, outdoor to outdoor transmission
wiring F1, F2 disconnection, short circuit or wrong
wiring
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
Transmission Error
285