Check Of R.v. Coil; Check Of Outdoor Fan Motor - Mitsubishi Electric MSZ-G09SV Service Manual

Cooling operates when heating is expected.

Check of R.V. coil

K
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
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.
Outdoor fan motor does not work.

Check of outdoor fan motor

L
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.
Outdoor terminal block
N
Indoor/ outdoor
2
connecting
wire
3
Three minutes after
power ON, is there
voltage 230V AC
between outdoor
terminal block 2 and
Yes
Fan
motor
1 2 3
4 5 6
CN771
Relay P.C. board
Outdoor terminal block
N
Indoor/ outdoor
2
connecting
wire 3
Three minutes after
power ON, is there
voltage 230V AC
between CN 721 1
and 2 on the relay
P.C. board?
Yes
Replace the
R.V. coil.
Repair indoor/ outdoor
connecting wire.
Press the
No EMERGENCY
OPERATION switch.
Does the 52C work?
Is there voltage approx.
230V AC either between
1 and 3 or between 3
and 5 at CN 771?
Replace the
outdoor fan motor.
80
R.V. coil
230V AC
1 2
CN721
Relay P.C. board
No Replace the
relay P.C. board.
Yes
Replace the indoor
No
electronic control
P.C. board.
No
Replace the
relay P.C. board.
Yes