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SiAF332111E
Troubleshooting by Error Code
Part 6 Service Diagnosis
301
5.58.2 Power Supply Insufficient or Instantaneous Abnormality (6/8 HP
Models)
Applicable
Models
RXMQ6/8AR
Error Code
U2
Method of Error
Detection
Detect the voltage of capacitor of the main circuit in the outdoor unit main PCB.
Error Decision
Conditions
When the voltage in the DC circuit (between diode module and power module) falls below
220-240 VDC (RXMQ6AR) or 380 VDC (RXMQ8AR).
Supposed
Causes
Abnormal power supply voltage
Instantaneous power failure
Open phase
Defective inverter PCB (RXMQ8AR)
Defective outdoor unit main PCB
Defective compressor
Defective main circuit wiring
Defective fan motor
Defective connection of signal cable
Troubleshooting
RXMQ6AR
There are some
defects in the power
supply conditions
aforementioned.
The insulation
resistance of the
compressor is less than
100 k
.
NO
YES
YES
Remedy the defects.
Replace the compressor
(M1C).
Check for power supply
conditions.
Check if power supply voltage
falls within the range of
220-240 V.
A
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Summary of Contents for VRV S RXQ4/5ARV1
Page 1: ...Service Manual Cooling Only 50 60 Hz RXQ4 5ARV1 RXMQ6ARV1 RXMQ8 10 12ARY1 SiAF332111E...
Page 369: ...SiAF332111E Wiring Diagrams Part 7 Appendix 363 RXMQ6ARV1 C 3D137051...
Page 370: ...Wiring Diagrams SiAF332111E 364 Part 7 Appendix RXMQ8ARY1 C 3D137060...
Page 371: ...SiAF332111E Wiring Diagrams Part 7 Appendix 365 RXMQ10 12ARY1 3D121610B...
Page 375: ...SiAF332111E Wiring Diagrams Part 7 Appendix 369 FXMQ40 50 63 80 100ARV1 3D127112 04 59...