Open Phase - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301

3.38 Open Phase

U1
Error Code
Applicable
RWEYQ72P, 84P
Models
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
 Power supply reverse phase
Supposed
 T phase open phase
Causes
 Defective condensing unit PCB
Troubleshooting
Service Diagnosis
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 supply (T
YES
phase) terminal section
(X1M) of the
condensing unit.
NO
Operation is
YES
normal if one place of
power supply line phase
is replaced.
NO
Troubleshooting by Indication on the Remote Controller
Fix the open phase. Requires
inspection of field power supply
section.
Reverse phase.
Countermeasure of the problem is
completed by phase replacement.
Replace the condensing unit PCB
(A1P).
215