4-5
c. Set the temperature setting potentiometer to a temperature above the shortening's current
temperature. This will cause the temperature control module to close and pass 24 VAC to
pin 12 (gray wire) of the control module.
d. Check the temperature probe as described in section 4.6.
e. If the temperature probe test passes and there is not 24 VDC present on pin 12 of the control
module, replace the temperature control module.
4.6 TESTING THE TEMPERATURE PROBE
WARNING
All power supplies must be disconnected before servicing the appliances.
Some appliances have more than one power supply. Make sure they are ALL
disconnected.
The temperature probe is a special type of resistor called a thermistor. Check the temperature probe
by performing the following:
a. Gain access to the temperature probe connection by removing the front panel. Disconnect
P10 and check the resistance of the probe at pins 2 & 4 of P10.
b. Place the OFF-ON-START switch in OFF. Use an ohm-meter to measure the resistance
across the probe. It should be about 100K ohms at room temperature (72°F, 22°C). If the
probe indicates an open or more than 200 ohms away from 100K ohms, replace the probe.
c. Re-install the probe wires and turn on the fryer. Start the fryer and raise the shortening
temperature to normal cooking temperature, approximately 350°F.
d. Unplug the temperature probe and measure the resistance again. It should read approxi-
mately 923.8 ohms ±10 ohms. If the resistance is different by more than 10 ohms, replace
the temperature probe.
4.7 TESTING THE HEATING ELEMENT INTERLOCK
The heating elements are protected from accidental over heating, due to lifting them out of the oil
while unit is ON, by an interlock limit switch. The switch is located on the right side (opposite the
High Limit switch) of the heating element pivot box.
a. This test requires that you gain access to the back of the interlock switch. Remove the four
screws from the small access plate on the top, right of the pivot box. Gently move the wiring
harness to the side to expose the wiring terminal of the interlock switch.
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