Troubleshooting The Gas Valve; Troubleshooting The Temperature Probe; Replacing The Reset Switch Relay - Welbilt Frymaster FilterQuick easyTouch FQG120T Service Manual

1.17.2 Troubleshooting the Gas Valve

Prior to checking for problems associated with the gas valve, ensure that the unit is calling for heat. Also, for non-CE units,
verify that the gas valve is in the ON position.
The following processes will assist you in troubleshooting the gas valve and ruling it out as a probable cause:
If 24 VAC is not present across gas valve main coil, the probable cause is the 24 VAC circuit. Refer to the 24 VAC circuit
•
troubleshooting guide in section 1.17.1.
If 24 VAC is present across gas valve main coil, check the incoming gas pressure and compare to the tables in section
•
1.13.
1. If incoming gas pressure is not correct, the probable cause is a problem with the gas supply to fryer.
2. If incoming gas pressure is correct, check the burner manifold gas pressure and compare it to the tables in section
1.13.
a. If burner manifold gas pressure is not correct, the probable cause is an improperly adjusted or failed gas valve.
Adjust the valve by following the procedure "Check Burner Manifold Pressure" in Section 1.13 of this manual.
If the valve cannot be adjusted, replace it.
b. If outgoing gas pressure is correct, the gas valve is okay.

1.17.3 Troubleshooting the Temperature Probe

Disconnect the temperature probe from the SIB board before testing temperature probe resistances to
avoid invalid readings
Prior to checking for problems associated with the temperature probe, inspect the probe body for damage while it is still in
the frypot. Remove and replace the probe if it is bent, dented, or cracked. Also, inspect leads for fraying, burning, breaks,
and/or kinks. If found, replace the probe.
The following processes will assist you in troubleshooting the gas valve and ruling it out as a probable cause:
Before testing the probe, determine the temperature of the cooking oil using a thermometer or pyrometer placed at the tip of the
questionable probe.
Unplug the temperature probe from the SIB board to test the resistance of the probe.
If resistance through the temperature probe is not approximately equal to that given in the Probe Resistance
•
Chart in section 1.18 for the corresponding temperature, the probe has failed and must be replaced.
If resistance through temperature probe is approximately equal to that given in the Probe Resistance Chart for
•
the corresponding temperature, measure the resistance through each of the previously tested pins to ground.
1. If resistance is not 5 mega-Ohms or greater in each pin, the probe has failed and must be replaced.
2. If resistance is 5 mega-Ohms or greater in each pin, the probe is okay.

1.17.4 Replacing the Reset Switch Relay

Disconnect the fryer from the electrical power supply. Relocate the fryer and remove the transformer box in the rear of the
fryer. Replace the relay marking the wires to ease reassembly. Once replaced, reconnect the power
CAUTION
1-27
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