Pro H50/55-Series Gas Fryers Service and Parts Manual - Frymaster

1.8.2 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 in Section 2.3 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 outgoing gas pressure and compare it to the
tables on page 2-4 or 2-5 of the Installation and Operation manual.
a. If outgoing 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 1.4 of this manual.
If the valve cannot be adjusted, replace it.
b. If outgoing gas pressure is correct, the gas valve is okay.
1.8.3 Troubleshooting the Temperature Probe
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, unplug the 15-pin connector from the controller to prevent unwanted
interference. 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 (J1 pins 2 and 6 for left side of dual unit) is not
approximately equal to that given in the Probe Resistance Chart for the corresponding
temperature, the probe has failed and must be replaced.
• If resistance through J3 pins 2 and 6 (J1 pins 2 and 6 for left side of dual unit) 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.
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