Mitsubishi Electric MSZ-FE12NA Service Manual download pdf (Page 31)

CN211

R111

Indoor electronic

control P.C. board

Indoor terminal

P.C. board

Fuse

(F11)

Varistor

(NR11)

Yes

1. The fan motor connector's lead wire is red, whereas is black.

2. Connect "+" of the tester to fan motor connector's lead

wire, and "-" to lead wire, otherwise the resistance cannot be

measured properly.

3. Please replace the fuse after removing the indoor terminal

P.C. board from the electrical box.

Yes

Does the unit operate with the remote controller?

Does OPERATION INDICATOR lamp light up by

pressing EMERGENCY

OPERATION switch?

Turn OFF the power supply.

Remove indoor fan motor connector CN211 and

vane motor connector CN151 from the indoor electronic

control P.C. board and turn ON the power supply.

Measure the resistance of the horizontal vane

motor coil.

Refer to 9-5.

Measure the resistance between CN211

and of the indoor fan motor connector.

Short circuit:

Replace the indoor fan motor.

Short circuit:

Replace the horizontal 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.

Replace the varistor (NR11) and fuse (F11). 3

Are the varistor (NR11) burnt

and the fuse (F11) blown?

Be sure to check both the fuse

and the varistor in any case.

Yes

Is the fuse (F11) blown only?

Yes

Is the resistance 1MΩ

or more?

Measure the resistance between

CN211 (+) and (-) of the indoor

fan motor connector. 1, 2

Replace the fuse (F11). 3

Replace the fuse (F11) and the indoor fan motor. 3

Is the resistance

approximate 4Ω?

Measure the resistance of cement

resistor R111 on the indoor electronic

control P.C. board.

Replace the indoor electronic control P.C. board.

Replace the indoor electronic control P.C. board

and the indoor fan motor.

Yes

MSZ-FE18NA

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Mitsubishi Electric MSZ-FE12NA Service Manual Page 31

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