Mitsubishi Electronics MSZ-FD35VAS, MSZ-FD25VA Check of indoor P.C. board and indoor fan motor

The unit does not operate with the remote controller.

Also, POWER lamp does not light up by pressing EMERGENCY OPERATION switch.

C Check of indoor P.C. board and indoor fan motor

Turn OFF the power supply.

Remove indoor fan motor connector CN211, vane motor connector CN151 and the i-see Sensor motor connector CN110 from the indoor electronic control P.C. board and turn ON the power supply.

Does the unit operate with the remote controller?	Yes
Does POWER lamp light up by pressing EMERGENCY
OPERATION switch?
No

Measure the resistance of the i-see Sensor motor coil.

Refer to 10-5.

Measure the resistance between CN211 3 and 4 of the indoor fan motor connector.

Measure the resistance of the horizontal vane motor coil and the vertical vane motor coil. Refer to 10-5.

Replace the varistor(NR11) and fuse(F11).

Yes

Short/open circuit:

Replace the i-see Sensor motor

and the indoor electronic control P.C. board.

Short/open circuit:

Replace the indoor fan motor.

Short/open circuit:

Replace the horizontal vane motor, the vertical vane motor and the indoor electronic control P.C. board.

Turn OFF the power supply.

Check both “parts side” and “pattern side” of the indoor electronic control P.C. board visually.

Are the varistor(NR11) burnt No
and the fuse(F11) blown?
Be sure to check both the fuse
and the varistor in any case.
Is the fuse(F11) blown only?		No
	Yes
Measure the resistance between				w1. The fan motor connector's1 lead wire is red, whereas 3 is black.
1(+) and 3(-) of the indoor fan
motor connector.				w2. Connect "+" of the tester to fan motor connector's1 lead
w1,w2
				wire, and "-" to 3 lead wire, otherwise the resistance cannot be
				measured properly.
			No
Is the resistance 1 M"
				Replace the fuse (F11) and the indoor fan motor.
or more?
	Yes

Replace the fuse (F11).

Measure the resistance of cement resistor(R111) on the indoor electronic control P.C. board.

Is the resistance approx. 4 "?

Yes

No

Replace the indoor electronic control P.C. board and the indoor fan motor.

Replace the indoor electronic control P.C. board.

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