63
Check of outdoor unit
E
Compressor and / or outdoor fan motor doesn’t stop.
Check of R.V. coil
F
After 30 seconds,
does compressor stop?
No
Yes
Is there 220-240V AC
between A1-A2 on the
compressor contactor?
Replace the
deicer P.C. board.
Yes
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.
4 Operate the unit for 1 minute or more and stop it by
pressing the EMERGENCY OPERATION switch again.
Ok
No
After 30 seconds, does
outdoor fan motor stop?
Replace the
deicer P.C. board.
Yes
Ok
No
Is there 220-240V AC
between 2/T1 on the
compressor contactor and N
on the outdoor terminal
block?
Yes
Replace the
compressor contactor.
No
Make the connection
of wiring correct.
After 3 minutes, is there
220-240V AC between CN721
1-3 on the deicer P.C. board?
Replace the
deicer P.C. board.
Yes
No
Replace the R.V. coil.
Disconnect the TAB52 on the deicer P.C. board.
Turn ON the power supply and operate
the indoor unit in HEAT mode by pressing
the EMERGENCY OPERATION switch.
After 3 minutes, is there
220-240V AC between CN721
1-3 on the deicer P.C. board?
Replace the
deicer P.C. board.
Yes
No
Replace the R.V. coil.
Disconnect the TAB52 on the deicer P.C. board.
Turn ON the power supply and operate
the indoor unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
Unit operates COOL mode even if it is set to HEAT mode.
Unit operates HEAT mode even if it is set to COOL mode.
<MSH-24/30RV>
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
Check of R.V. coil
F
OB272-2.qxp 02.1.26 1:23 PM Page 63
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