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1.11.2 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.
• If 24 VAC is present across gas valve main coil, check the incoming gas pressure and compare
to the tables on page 2-4 of the Installation and Operation manual.
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 on page 2-7 of the Installation and Operation manual.
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 1.7 of this manual. If the valve cannot be adjusted, replace
it.
b. If outgoing gas pressure is correct, the gas valve is okay.
1.11.3 Troubleshooting the Temperature Probe
CAUTION
Disconnect the CM7 computer 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 temperature probe and ruling it out as
a probable cause:
Before testing the probe, determine the temperature the cooking oil using another thermometer or
pyrometer placed at the tip of the questionable probe.
• If resistance through J3 pins 2 and 6 is not approximately equal to that given in the Probe
Resistance Chart on the following page for the corresponding temperature, the probe has
failed and must be replaced.
• If resistance through J3 pins 2 and 6 is approximately equal to that given in the Probe
Resistance Chart on the following page 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.
1.11.4 Replacing the Transformer or Filter Relay
Disconnect the fryer from the electrical power supply. Remove the cover from the transformer box
in the rear of the fryer to expose the interior of the transformer box. Replace the transformer or filter