19
Check of outdoor unit
Does compressor stop?
No
Yes
Is there 230 V AC between 3 on the
compressor contactor (52C) and 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 does not stop.
Check of R.V. coil
Unit operates COOL mode even if it is set to HEAT mode.
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 230 V AC between
CN721 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.
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 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 230 V AC between
CN721 on the deicer P.C.
board?
