Check Of R.v. Coil; Check Of Outdoor Fan Motor - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

Cooling operates when heating is expected.

Check of R.V. coil

K
Measure resistance of the R.V. coil to check if it is defective or not.
If the connector CN 721 is not connected or the R.V. coil is open, the voltage occurs between the terminals even when the control is OFF.
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
IPM.
Turn ON the power supply to indoor unit and press
the EMERGENCY OPERATION switch.
Outdoor terminal block
TB1
L1
Power
N
supply
L2
Relay P.C. board
Is there voltage of
208/230V AC between
outdoor terminal block(TB1)
and ?
L1 L2
Yes
Fan
motor
1 2 3
4 5 6
CN771
Is there voltage of
208/230V AC
No
between CN 721 1
and 2 on the relay
P.C. board?
Yes
Replace the
R.V. coil.
Refer to M "Check of
No
power supply." on
page 53.
Is there voltage of
approx. 208/230V AC
either between 1 and 3
or between 3 and 5 at
CN 771?
Replace the
outdoor fan motor.
52
R.V. coil
208/230V AC
1 2
CN721
Relay P.C. board
Replace the
relay P.C. board.
No
Replace the
relay P.C. board.
Yes