Reverse Phase, Open Phase - Daikin REYQ-XA Service Manual

SiUS371901E

3.62 Reverse Phase, Open Phase

3.62.1 Reverse Phase, Open Phase (Except REYQ72-120XAYDU)
U1
Error Code
Applicable REYQ72-168XATJU, REYQ144/168XAYDU, REYQ72-168XAYCU
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
Supposed
Causes
Troubleshooting
Service Diagnosis
Power supply reverse phase
T phase open phase
Defective outdoor unit main PCB (A1P)
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 phase) terminal
section (X1M) of the
outdoor unit.
NO
Operation
is normal if one
phase of power supply
line phase is
replaced.
NO
YES
YES
Troubleshooting by Error Code
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).
340