Main Control Board - KitchenAid KBFC42FS Technical Education

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

MAIN CONTROL BOARD

Refer to page 4-12 for the procedure for accessing the main control board.
NOTE: See the chart for the main control board test specifications.
P8
3 2 1
1
P5
P4 P3
1 1
P6
1
P7
WARNING
Electrical Shock Hazard
PLUG PIN # DESCRIPTION
1 Communication Line
P2 2 Display Voltage
3 GND
1 Ref. Thermistor
2 Frz. Thermistor
P3
3 Ref. Thermistor Output
4 Frz. Thermistor Output
1 Ref. Door Sw Enable
2 Frz. Door Sw Enable
3
4 Ref. Door Input
5 Ice Maker Valve Input
P4
6 Dispenser Valve Input
7 Bimetal Input
8 Frz. Door Input
1 AC GND
2 AC L1
P5 3 AC Neutral
4 AC Neutral
5 AC L1
1 Condenser Fan
2
3
P6
4 Defrost Heater
5 Ice Maker Enable
1 Air Door
2 Air Door
3 Compressor Drive
4 Evap. Fan Feedback
5 Evap. Fan Constant
P7
6 Air Door
7 Air Door
8 Compressor Drive
9 Evap. Fan Ground
10 Evap. Fan Run Voltage
5-8
OUTPUT CONDITION
N/A
12 VDC Measured at pins 2 & 3
GND
GND
GND
5 VDC Measured at pins 1 & 3
5 VDC Measured at pins 2 & 4
120 VAC
120 VAC
N/A
120 VAC Voltage present when door is open
120 VAC Voltage present when ice maker is energized
120 VAC Voltage present when dispenser valve is energized
120 VAC Voltage present when bimetal is closed
120 VAC
AC GND
120 VAC
AC Neutral
AC Neutral
120 VAC
120 VAC Voltage present when condenser fan is on
N/A
N/A
120 VAC Voltage present when defrost heater is on
Voltage present when I/M bail arm is down & I/M
120 VAC
is active
3 - 6 VDC Measured at pins 3 & 8
N/A
12 VDC Measured at pins 5 & 9
3 - 6 VDC Measured at pins 3 & 8
Evap. GND
5 - 12 VDC Measured at pins 9 & 10