Open Phase Or Power Supply Voltage Imbalance - Daikin ZQG71~140L7V1B Service Manual

Troubleshooting by Remote Controller

4.27 Open Phase or Power Supply Voltage Imbalance

P1
Remote
Controller
Display
Applicable
RZQG
Models
Method of Error
The error is detected according to the voltage waveform of main circuit capacitor built in
Detection inverter.
Error Decision
When the aforementioned voltage waveform becomes identical with the waveform of the power
Conditions supply open phase.
Supposed  Open phase
Causes  Voltage imbalance between phases
 Defective outdoor unit PCB
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Measure the power supply voltage
between 3 phases. (R-S, S-T, T-R)
YES
Is the voltage
rated 10%?
NO
Is the voltage
imbalance between phases
less than ±10%?
YES
174
  Defective main circuit capacitor

 Power unit (Disconnection in diode module)

 Defective magnetic relay (K1R, K10R)

 Improper main circuit wiring
YES
NO
ESIE12-06
Field factors
Field factors
Replace the outdoor unit
inverter PCB.
Service Diagnosis