Reverse Phase, Open Phase - Daikin VRV S RXQ4/5ARV1 Service Manual

Troubleshooting by Error Code

5.57 Reverse Phase, Open Phase

Applicable RXMQ10/12AR
Models
U1
Error Code
Method of Error Each phase is detected by reverse phase detection circuit and it is determined whether the
Detection phase is reversed or not.
Error Decision
The power supply is in reverse phase, or T phase is in open phase.
Conditions
Supposed
 Power supply reverse phase
Causes  Power supply T phase open phase
 Defective outdoor unit PCB
Troubleshooting
298
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is there an open
YES
phase at the power supply
terminal (X1M) T phase of the
outdoor unit?
NO
Operation is
YES
normal if one phase of
power supply line phase is
replaced.
NO
SiAF332111E
Fix the open phase.
Requires inspection of
field power supply.
Power supply reverse phase.
After the phase replacement,
the countermeasures are
completed.
Replace the outdoor unit
main PCB (A1P).
Part 6 Service Diagnosis