Mitsubishi Electric MSZ-G09SV Service Manual page 84

MSZ-G20SV - MUZ-G20SV -
E1
When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan doesn't operate.
R Check of indoor fan motor
No
Are lead wires connected?
Reconnect the lead wires.
Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.4 and then No.1 and No.3.
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn't operate with the remote controller.
Check of remote controller and receiver P.C. board
S
W Check if the remote controller is exclusive for this air conditioner.
Switch on the remote controller.
Is LCD display on the remote con-
troller visible?
Yes
Remove batteries, then set them back and
press the RESET button. Check if the unit
operates with the remote controller.
Does the unit operate with the
remote controller?
Yes
OK
on page 84 ~
E1
AA
R
Turn OFF the power supply.
Check connector CN211 visually.
Yes
Is soldering point of the connector correctly soldered?
Is resistance 0 (short circuit) or ∞ (open circuit)?
Yes ( 0 or ∞ )
Repair the indoor fan motor.
No
Replace the batteries.(Refer to page 66.)
(not clear)
No
Turn on a radio to AM and press switch on
the remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Measure the voltage between receiver P.C. board connector CN301 No.2(+)and No.3(-) when the remote controller
button is pressed.
Is the voltage approx. 4V DC?
Replace the receiver P.C. board.
on page 89
Yes
Insert screwdriver into air outlet to rotate indoor
fan motor slowly for 1 revolution or over, and
No measure voltage No.2(+) and No.3(-) at CN121.
(others)
No
Replace the indoor electronic control P.C. board.
No
Yes
Yes
No
Yes
No(5V or 0V DC)
84
No
Resolder it.
Does voltage repeat 0V DC and 5V DC?
Yes
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
Replace the indoor electronic control
P.C. board.