Open Phase - Daikin VRV RXYMQ-A Series Service Manual

Troubleshooting by Error Code

5.55 Open Phase

Applicable RXYMQ4-6AYFK
Models
U1
Error Code
Method of Error
The phase of each phase is detected by phase detection circuit and open phase is judged.
Detection
Error Decision
When any phase is open phase.
Conditions
Supposed  Abnormal supply voltage
 Open phase
Causes
 Defective inverter PCB
Troubleshooting
246
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Power supply
harness
NO
(3-phase, 4 wires) is
properly connected to
the terminal
block.
YES
Power supply
voltage falls within
NO
380 V to 415 V between
L1-L2, L2-L3 and
L3-L1.
YES
The connectors
between the terminal
NO
block, noise filter PCB and
inverter PCB are properly
connected.
YES
The fuse of the noise NO
filter PCB is blown out.
YES
SiME332106E
Connect the harness properly.
Check the power supply for
abnormalities.
Connect the connectors properly.
Replace the inverter PCB. (A3P)
Replace the noise filter PCB (A2P) and
the inverter PCB (A3P).
Part 6 Service Diagnosis