Panasonic 26PEK2U6 26PEK2U6 Service Manual - Page 252
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 No Is power OK? Correct power line. Yes Is current detection No circuit wiring OK? Check and correct wiring. 4. Service procedures Are wiring and connector No 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? Replace C1 and TS sensors. Yes Is there overload? No Replace electronic control valve. Remove the cause. Yes Replace outdoor unit control PCB. 4-8