Mitsubishi Electric MSH-C18TV Service Manual page 41

MSH-C24TV
Operate the unit in COOL or HEAT mode
by pressing the EMERGENCY
OPERATION switch.
Test run operation operates for 30 minutes.
E Check of outdoor unit
Compressor and/or outdoor fan motor doesn't stop.
1 Turn OFF the power supply.
2 After 30 seconds, turn ON the power supply again.
3 Operate the unit in COOL or HEAT mode by pressing the
EMERGENCY OPERATION switch for 1 minute or more.
4 Stop it by pressing the EMERGENCY OPERATION
switch twice or once.
After 30 seconds,
does compressor stop?
After 30 seconds, does
outdoor fan motor stop?
Start
Compressor
doesn't operate.
Is there 5V DC between
J101 - J401 on the deicer + -
P.C. board?
Refer to page 46.
Yes
Is there 230V AC between
A1-A2 on the compressor
contactor(52C)?
Yes
Is there 230V AC between
2/T1 on the compressor
contactor(52C) and N on the
outdoor terminal block?
Yes
Check the compressor.
Outdoor fan motor
doesn't operate.
Is there 5V DC between
J101 - J401 on the deicer + -
P.C. board?
Refer to page 46.
Yes
Is there 230V AC CN711
1-3 or 2-3 on the deicer
P.C. board?
Yes
Check the outdoor fan
motor. Refer to page 38.
<MSH-C24TV only>
Is there 230V AC between
No
A1-A2 on the compressor
contactor(52C)?
Yes
Ok
Replace the
deicer P.C. board.
No
Replace the
deicer P.C. board.
Yes
Ok
Is there 230V AC between
No
CN730 1-3 on the deicer
P.C. board?
Yes
Replace the
deicer P.C. board.
No
Replace the
deicer P.C. board.
Is there 230V AC between
No
1/L1 on the compressor
contactor(52C) and N on the
outdoor terminal block?
Yes
Replace the compressor
contactor(52C).
Is there 230V AC between
No
CN730 1-3 on the deicer
P.C. board?
Yes
Replace the
deicer P.C. board.
No
Replace the
deicer P.C. board.
Is there 230V AC between
No
2/T1 on the compressor
contactor(52C) and N on
the outdoor terminal block?
Yes
Replace the
compressor
contactor(52C).
41
No
Make the connection
of wiring correct.
No
Make the connection
of wiring correct.
No
Make the connection
of wiring correct.
No
Make the connection
of wiring correct.
Yes