Check Of Indoor Fan Motor; Check Of Remote Controller And Receiver P.c. Board - Mitsubishi Electric MSZ-G09SV Service Manual

When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan does not operate.

Check of indoor fan motor

G
Turn OFF the
power supply and
check the connector
CN 211 visually.
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller.

Check of remote controller and receiver P.C. board

H
wCheck if the remote controller is exclusive for this air conditioner.
wIn case of replacing the receiver P.C. board, replace the indoor electronic control P.C. board with it because
they are unified.
Switch on the
remote controller.
Is LED display on
remote controller
visible?
Yes
Remove batteries, then set them back and
press the RESET button. Check if the unit
operates with the remote controller.
Tune a radio in to
Does the unit
No
AM and press
operate with
OPERATE/STOP
remote
(ON/OFF) button
controller?
on remote
controller.
Yes
Ok
Yes
Indoor electronic
control P.C. board
Replace batteries and
No
then press RESET
(not clear)
button.
Refer to page 66.
Is noise
heard from
the radio?
No
Replace the
remote
controller.
Disconnect lead wires from
CN 211 on indoor electronic
control P.C. board.
Measure resistance
between lead wire 1 and 3
and then 2 and 3.
CN211
3
2
1
Fan
motor
Are there any
No
fluorescent lights
Yes
of inverter or
radio start type
within 1 meter?
Yes
Reinstall the unit
away from the lights.
Attach a filter on
receiving part.
Remote
controller
78
Replace the
indoor fan motor.
Yes(0 or ∞)
Is resistance
0"(short circuit) or
∞(open circuit)?
No(othes)
Replace the
indoor
electronic
control P.C.
board.
Replace the indoor
electronic control
P.C. board with
power monitor,
receiver P.C. board.
Power monitor,
receiver P.C. board
LD101T
1 1
2 2
3 3
4 4
5 5
Indoor electronic
control P.C. board