[P12 error]

Turn off the power.

Is there no connection error or

disconnection on connectors CN333 YES and CN334 of indoor unit P.C. board

(MCC-1570)?

Correct connection

of connector.

NO

Remove connectors CN333

and CN334 of indoor unit P.C. board

(MCC-1570).

Does the fan rotate without trouble when handling the fan with hands?

YES

Are resistance values

between phases at fan motor connector CN333 motor side of indoor P.C. board (MCC-1570) correct? 1

NO

Incorrect

CN333

CN334

Replace indoor fan motor.

Replace indoor fan motor.

Correct

1

Are not coil windings between ￿ (Red lead) and ￿ (White lead), between ￿ (White lead) and ￿ (Black lead),

between ￿ (Black lead) and ￿ (Red lead) opened or shorted?

The resistance should be the resistance value below.

SM40, SM45, SM56, SM80 Approx. 70 to 100SM110, SM140, SM160 Approx. 27 to 40

• Is not grounded between cabinet and ￿, ￿, ￿. It should be 10Mor more.

Is resistance value of

fan motor connector CN334 motor side Incorrect of indoor P.C. board

(MCC-1570) correct? 2

Replace indoor fan motor.

Correct

2

Resistance value confirmation of the fan motor position detection circuit

Is not status between ￿ (Yellow lead) and ￿ (Pink lead) opened or shorted? The resistance should be approx. 5k to 20k.

Is output of

NO

indoor fan motor position

 

 

detection signal correct? 3

 

Replace indoor fan motor.

YES

3

Confirmation of the fan motor position detection signal

Using a voltage tester, measure voltage between CN334 ￿ and ￿ on the indoor P.C. board

(MCC-1570) under condition that CN333 and CN334 are mounted and the power supply is turned on. When rotating the fan slowly with hands, the pin voltage should shake between 0 and 5V.

Between ￿ and ￿: 5V

Check indoor P.C. board

(MCC-1570).

Defect Replace

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Toshiba RAV-SP564ATZ-E, RAV-SP804ATZG-E, RAV-SP804ATZ-E, RAV-SP804AT-E, RAV-SP564ATZG-E, RAV-SP454AT-E P12 error, CN333 CN334