P1" Open Phase Or Power Supply Voltage Imbalance - Daikin SkyAir Service Manual

SiBE28-804

5.34 "P1" Open Phase or Power Supply Voltage Imbalance

P1
Remote
Controller
Display
Applicable RZQ(S)71~140
Models
Method of Malfunction is detected according to the voltage waveform of main circuit capacitor built in
inverter.
Malfunction
Detection
Malfunction When the aforementioned voltage waveform becomes identical with the waveform of the power
supply open phase.
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Open phase
Voltage imbalance between phases
Faulty outdoor inverter PC board
 •
Faulty main circuit capacitor

•
Power unit (Disconnection in diode module)

•
Faulty Magnetic Relay (K11R, K12R)

•
Improper main circuit wiring
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
LED on the
outdoor unit PC board
(Open phase?)
phase of power supply
imbalance between phases
(Note)
Target : ±10V between phases,
R-S, S-T, T-R
Troubleshooting by Remote Controller Display / LED Display
Check
NO
YES
Open
YES
voltage?
NO
Is the voltage
YES
large?
NO
Other factors than open
phase
Field factors
Field factors
Replace the outdoor PC board
(A2P).
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