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4-8
4. Service procedures
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[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