Daikin VRV RXYMQ-A Series, Руководство по обслуживанию

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SiME332106E Troubleshooting by Error Code
Part 6 Service Diagnosis 247
5.56 Power Supply Insufficient or Instantaneous Abnormality
Applicable
Models
All outdoor unit models
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 (RXYMQ4AVMK) or 380 VDC (RXYMQ4-6AYFK).
Supposed
Causes
 Abnormal power supply voltage
 Instantaneous power failure

Open phase
 Defective inverter PCB (RXYMQ4-6AYFK)
 Defective outdoor unit main PCB
 Defective compressor
 Defective main circuit wiring
 Defective fan motor
 Defective connection of signal cable
Troubleshooting RXYMQ4AVMK
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.