Toshiba RAV-SM456BT-E, RAV-SM406BT-TR, RAV-SM1406BT-E, RAV-SM1606BT-E P12 error, CN333 CN334

[P12 error]

Turn off the power.

Is the static pressure setting correct?

YES

Is the capacity setting correct?

YES

Are not there connections errors or

disconnection on connectors CN333 and CN334

of indoor unit P.C. board (MCC-1631)?

NO

Remove connectors CN333 and CN334 of indoor unit P.C. board (MCC-1631).

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-1631) correct? *1

YES

NO

Correct setting of the static pressure.

NO Change cappacity setting.

YES

Correct connection of connector.

NO

Replace indoor fan motor.

NO

Replace indoor fan motor.

*1

• Are not coil windings between 1 (Red lead) and 3 (White lead), between 3 (White lead) and 5 (Black lead), between

5(Black lead) and 1 (Red lead) opened or shorted?

→For resistance, see the winding Resistance of Fan Motor. (Page 57)

Is resistance value of fan motor connector CN333 at motor side of indoor P.C. board (MCC-1631) correct? *2

YES

Is signal output of indoor fan motor

position detection correct? *3

YES

Check indoor P.C. board

(MCC-1631).

Defect → Replace

NO

Replace indoor fan motor.

*2

Check resistance of fan motor position detection circuit.

Is not coil winding between 1 (Yellow lead) and 4 (Pink lead) opened or shorted? → Resistance: Approx. 5 to 20kΩ

NO

Replace indoor fan motor.

*3

Check fan motor position detection signal.

•Using a tester, measure the voltage between CN334 1 and 5 of indoor P.C. board (MCC-1631) under condition that CN333 and CN334 are mounted and the power is turned on.

→Rotate the fan slowly with hands, and check the pin voltage swings between 0 to 5V voltage.

•Between 4 and 5 : 5V

CN333

CN334

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