Panasonic U-8ME1E81 Service Manual page 170

4. 2WAY Alarm Codes
P29 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
6
P29
Inverter compressor missing phase or lock alarm
This alarm may occur at start, and occurs when missing phase or lock is detected, and when a
DCCT failure occurs.
Generally this alarm occurs when the refrigerant pressure balance is uneven at start, or when
inverter compressor lock occurs, there is a missing phase in the inverter compressor wiring, or a
DCCT failure occurs. This can be judged to be starting trouble which is not caused by HIC.
Check the power wiring and connector wiring.
DCCT failure (replace PCB) or compressor failure
—
Use a tester to measure the voltage between the DCCT output terminal on the rear of the PCB
and the ground. If the voltage is not within 2 – 3 V, then the DCCT has malfunctioned.
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2WAY SYSTEM
Trouble Diagnosis