Mitsubishi MS-18RV Service Manual download pdf (Page 52)

Replace the receiver P.C. board.

Replace the remote controller.

Replace the batteries.(Refer to page 47.)

Switch on the remote controller.

Repair or replace the indoor fan motor.

Re-solder it.

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.2(MS-18/24RV)

: No.1 and No.4 and then No.3 and No.4(MS-30RV).

Turn OFF the power supply.

Check connector CN211 visually.

Re-connect the lead wires.

Yes

Check of indoor fan motor

Check of remote controller and receiver P.C. board

Indoor fan doesn’t operate.

Are lead wires connected?

Is soldering point of the connector

correctly soldered?

Insert screwdriver into air outlet to rotate indoor fan

motor slowly for 1 revolution or over, and measure

voltage between No.2(+) and No.3(-) on CN121.

Is resistance 0 (short circuit) or ∞ (open circuit)?

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller.

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 No.2(+) and No.1 when remote controller button

is pressed.

Is the voltage approx. 4V DC?

Replace the indoor electronic control P.C.

board.

● Re-install the unit away from lights.

● Attach a filter on receiving part.

Yes ( 0 or ∞ )

(others)

Yes

Is LCD display on the remote

controller displayed?

Remove the batteries, then set them back

and press the RESET button. Check if the

unit operates with the remote controller.

Yes

Does the unit operate with the

remote controller?

Yes

(not clear)

Yes

No(5V or 0V DC)

wCheck if the remote controller is exclusive for this air conditioner.

Replace the indoor electronic control P.C. board.

Does voltage repeat 0V DC and 5V DC?

Yes

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Mitsubishi MS-18RV Service Manual Page 52

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