Reverse Phase, Open Phase - Daikin VRV RXYQ72-384XAYCA Service Manual

Troubleshooting by Error Code

3.59 Reverse Phase, Open Phase

Applicable
All outdoor unit models
Models
U1
Error Code
Method of Error
The phase of each phase are detected by reverse phase detection circuit and right phase or
Detection reverse phase are judged.
Error Decision
When a power supply is reverse phase, or T-phase is open phase.
Conditions
Supposed
 Power supply reverse phase
Causes  T phase open phase
 Defective outdoor unit main PCB (A1P)
Troubleshooting
325
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
There is
an open
phase at the power
YES
supply (T phase) terminal
section (X1M) of the
outdoor unit.
NO
Operation
is normal if one
YES
phase of power supply
line phase is
replaced.
NO
SiUS342004EB
Fix the open phase. Requires
inspection of field power supply
section.
Reverse phase.
Countermeasure of the problem is
completed by phase replacement.
Replace the outdoor unit main
PCB (A1P).
Part 6 Service Diagnosis