Open Phase Or Power Supply Voltage Imbalance - Daikin RZQ Series FCQ20EVA Service Manual

Troubleshooting by Remote Controller

4.34 Open Phase or Power Supply Voltage Imbalance

P1
Error Code
Applicable RZQ
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.
 Open phase
Supposed
 Voltage imbalance between phases
Causes
 Defective outdoor unit inverter PCB
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check LED on the
outdoor unit PCB (Open
power supply voltage?
imbalance between phases
Note:
1. Target: ±10V between phases
137

 Defective main circuit capacitor

 Power unit (Disconnection in diode module)

 Defective magnetic relay

 Improper main circuit wiring
NO
phase?)
YES
Open phase of
YES
NO
Is the voltage
YES
large? (∗1)
NO
SiME281501E
External factor
Field factors
Field factors
Replace the outdoor unit
inverter PCB.
Service Diagnosis