Welbilt Koolaire KD0270A, Technician'S Handbook, Page: 98 / 136

98 Part Number STH047 Rev01 10/18
ON/OFF/WASH Toggle Switch
Function
The switch is used to place the ice machine in ON, OFF or
WASH mode of operation.
Specifications
Single-pole, double-throw switch. The switch is connected
into a varying low D.C. voltage circuit.
Check Procedure
NOTE: Because of a wide variation in D.C. voltage, it is not
recommended that a voltmeter be used to check toggle
switch operation.
1. Inspect the toggle switch for correct wiring.
2. Isolate the toggle switch by disconnecting all wires
from the switch, or by disconnecting the Molex
connector from the control board.
3. Check across the toggle switch terminals using a
calibrated ohmmeter. Note where the wire numbers
are connected to the switch terminals, or refer to the
wiring diagram to take proper readings.
Switch Setting Terminals Ohm Reading
ON 24-21 Open
24-20 Closed
20-21 Open
WASH 24-20 Open
24-21 Closed
20-21 Open
OFF 24-20 Open
24-21 Open
20-21 Open
Replace the toggle switch if ohm readings do not match all
three-switch settings.