Panasonic 26PSU1U6 Tech Data - Service Manual - Page 172

Details of Alarm Messages, Alarm P29], MDC trouble

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4-3. Details of Alarm Messages (1) [Alarm "P29"] (MDC trouble) Input power detection circuit trouble Compressor does not run. Breakdown Motor current detection circuit trouble Is power OK? No Correct power line. Yes Is current detection No circuit wiring OK? Check and correct wiring. 4. Service procedures Are wiring and No connector connections OK? Yes Is compressor No OK? Yes Check and correct wiring. Ground Yes fault? Coil resistor Yes short circuit? Replace compressor. Coil open Yes circuit? No Is there abnormal refrigerant No Replace 4 accumulation? compressor. Yes Is operation of electronic No control valve OK? Are C1 and TS No sensors OK? Yes No Is there overload? Replace electronic control valve. Remove the cause. Replace C1 and TS sensors. Yes Replace outdoor unit control PCB. 4-8

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4-8
4. Service procedures
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
[Alarm “P29”]
(MDC trouble)
(1)
Input power detection circuit trouble
Compressor does not run.
Breakdown
Motor current detection circuit trouble
Is power OK?
Correct power line.
Is
current
detection
circuit wiring
OK?
Check and correct
wiring.
Are
wiring and
connector
connections
OK?
Check and correct
wiring.
Is
compressor
OK?
Ground
fault?
Replace
compressor.
Coil
resistor
short circuit?
Coil open
circuit?
Is there
abnormal refrigerant
accumulation?
Replace
compressor.
Is
operation of
electronic
control valve
OK?
Replace outdoor
unit control PCB.
Are
C1 and TS
sensors
OK?
Replace C1 and
TS sensors.
Replace electronic
control valve.
Is there overload?
Remove
the cause.
4-3. Details of Alarm Messages
4