Mitsubishi Electric MS-C18TV-E1 WH Service Manual page 35

Check of outdoor unit
E
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 mode by pressing the
EMERGENCY OPERATION switch.
4 Operate the unit for 1 minute or more and stop it by
pressing the EMERGENCY OPERATION switch again.
After 30 seconds, does
compressor stop ?
After 30 seconds, does
outdoor fan motor stop ?
OK
<MS-C24TV only>
Is there 230V AC between
No
3-N on the outdoor terminal
block?
Yes
OK
Is there 230V AC between
3-N on the indoor terminal
block?
Replace the indoor
electronic control P.C.
board.
Is there 230V AC between
No
3-N on the indoor terminal
block?
Yes
Replace the indoor
electronic control P.C.
board.
Is there 230V AC between
No
1 on the compressor
contactor(52C) and N on the
outdoor terminal block?
Yes
Replace the compressor
contactor(52C).
No
Reconnect the continuity
of indoor and outdoor
unit connection.
Yes
Reconnect the continuity
No
of indoor and outdoor
unit connection.
Yes
35
No
Make the connection
of wiring correct.
Yes