Toshiba MMD-AP0726HP-UL Service Manual page 74

Check code
[P12]
Indoor fan motor trouble
Power supply ON
Measure the power supply voltage
and if the voltage is normal or not.
208-230V
YES
If the power relay operates
normally or not.
(the voltage between power relay
4pin-GND and 6pin-GND are
187-229/207-253V
YES
Power supply OFF
The ambient temperature is
normal or not.
YES
If there is any poor connection of
the connector of MCC-1610, or
disconnection of the motor lead.
NO
Remove the motor lead from
CN703,704,705 of MCC-1610
If the fan motor is locked or not.
(Unable to rotate it by hand)
NO
If the winding resistance of the
motor is correct or not.
YES
Replacement of the MCC-1610
Check code name
NO
Power supply voltage is less than 187/207V
Power supply voltage is more than 229/253V
NO
*1 : Power relay pin No,
NO
more than 176°F (80°C)
YES
YES
NO
*2
*2 : Measure the resistance value of each winding by using the tester
Red
White
Black
Fan motor inside wiring diagram
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1. Installation environment trouble
2. Electric parts trouble
3. Wiring trouble of fan motor connector
4. Fan motor trouble
5. Indoor P.C. board trouble
Adjustment of the main power
supply on the equipment side
The voltage between
YES
the terminals of CN602
of MCC-1610 is 12V
NO
Replacement of the power relay
Replacement of the MCC-1610
Improves the installation
environment
Correction of the connection
of the connector
Replacement of the motor
SWF-340W1000-1
at 68°F (20°C)
Cause
Position Resistance value
Red - White 2.6 ± 0.3 Ω
White - Black 2.6 ± 0.3 Ω
Black - Red 2.6 ± 0.3 Ω