Mitsubishi Electric MUH-GA20VB-E1, Руководство по обслуживанию

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B B
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.
Start
Turn OFF the power supply.
After 1 minute, turn ON
power supply again.
Compressor and/or outdoor fan motor doesn’t stop.
C C
Check of R.V. coil
Unit operates COOL mode even if it is set to HEAT mode.
w
First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.
After 3 minutes, does the unit
operate in HEAT mode?
Ok
No
Is there 230V AC between
CN721
1
–
2
on the deicer
P.C. board?
Replace the
deicer P.C. board.
Yes
Yes
Yes
No
Replace the R.V. coil.
Turn ON the power supply and operate
the indoor unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
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.
C C
Check of R.V. coil
After 3 minutes, does the unit
operate in COOL mode?
OK
Yes
Yes
No
Replace the
deicer P.C. board
No
Replace the R.V. coil.
Turn ON the power supply and operate
the indoor unit in HEAT mode by pressing
the EMERGENCY OPERATION switch.
Is there 230V AC between
CN721
1
–
2
on the deicer P.C.
board?
OB387B-1.qxp 07.5.23 2:48 PM Page 23