80
Check of R.V. coil
K
Cooling operates when heating is expected.
Check of outdoor fan motor
L
Outdoor fan motor does not work.
Disconnect the connector between the
compressor and transistor module.
Turn ON the power supply to indoor unit,
and press twice (heating) the
EMERGENCY OPERATION switch.
Press the
EMERGENCY
OPERATION switch.
Does the 52C work?
Replace the
outdoor fan motor.
First, measure resistance of the R.V. coil to check if it is defective or not.
The voltage occurs between the terminals even when the control is OFF, the connector CN 721 is not connected or the R.V. coil is open
Three minutes after
power ON, is there
voltage 230V AC
between CN 721
1
and
2
on the relay
P.C. board?
Three minutes after
power ON, is there
voltage 230V AC
between outdoor
terminal block
2
and
Is there voltage approx.
230V AC either between
1
and
3
or between
3
and
5
at CN 771?
Indoor/ outdoor
connecting
wire
Outdoor terminal block
N
2
3
Disconnect the connector CN 771 on the relay P.C.
board.
Disconnect the connector between compressor and
transistor module.
Turn ON the power supply to indoor unit and press
the EMERGENCY OPERATION switch.
1
CN721
Relay P.C. board
2
R.V. coil
230V AC
Yes
Yes
Yes
No
No
CN771
Relay P.C. board
1
2 3
4
5 6
Fan
motor
Outdoor terminal block
N
2
3
Replace the
relay P.C. board.
Repair indoor/ outdoor
connecting wire.
No
Replace the indoor
electronic control
P.C. board.
No
Yes
Replace the
relay P.C. board.
Replace the
R.V. coil.
Indoor/ outdoor
connecting
wire
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