30
After 30 seconds,
does compressor stop?
No
Yes
Is there 230V AC between
A1-A2 on the compressor
contactor (52C)?
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 230V AC between
2/T1 on the compressor
contactor (52C) and N on the
outdoor terminal block?
Yes
Replace the
compressor contactor(52C).
No
Rectify the connecting
wire.
After 3 minutes, does the unit
operate in HEAT mode?
Ok
No
Replace the
deicer P.C. board.
Yes
Yes
No
Replace the R.V. coil.
Disconnect the TAB52 on the deicer P.C. board. (MUH-GA60/GA80VB)
Turn ON the power supply and operate the indoor unit in COOL mode
by pressing the EMERGENCY OPERATION switch.
Is there 230V AC between
CN7211 – 2 (MUH-GA50VB)/
CN7211 – 3 (MUH-GA60/GA80VB)
on the deicer P.C. board?
MUH-GA50VB
MUH-GA60VB
MUH-GA80VB
BB
Check of outdoor unit
Does compressor stop?
No
Yes
Is there 230V AC between 3 on the
compressor contactor (52C) and N on the
outdoor terminal block (TB1)?
Replace the
deicer P.C. board.
Yes
OK
No
Does outdoor fan motor stop?
Replace the
deicer P.C. board.
Yes
OK
No
Rectify the connecting wire.
Turn OFF the power supply.
After 1 minute, turn ON
power supply again.
Compressor and/or outdoor fan motor doesn’t stop.
Unit operates HEAT mode even if it is set to COOL mode.
w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
Check of R.V. coil
C
OB368B-1.qxp 10.5.25 9:14 AM Page 30
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