Details Of Alarm Messages - Sanyo C4272R Service Manual

4-3. Details of Alarm Messages

(1) [Alarm "P29"]
(MDC trouble)
1
2
3
4
5
6
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
No
Check and correct
detection
wiring.
circuit wiring
OK?
Are
wiring and
No
Check and correct
connector
wiring.
connections
OK?
Yes
Is
No
compressor
OK?
Ground
Yes
resistor
short circuit?
Coil open
circuit?
Is there
No
abnormal refrigerant
compressor.
accumulation?
Yes
Is
operation of
No
C1 and TS
electronic
control valve
OK?
Yes
Replace electronic
control valve.
No
Remove
Is there overload?
the cause.
Yes
Replace outdoor
unit control PCB.
Yes
Replace
compressor.
fault?
Coil
Yes
Yes
No
Replace
Are
No
Replace C1 and
sensors TS sensors.
OK?
IV-8
4. Service procedures
SM831148