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Fryer cut off but pilot stays on

Fryer was used with outside concessions on a 20lb lp cylinder. moved to inside concessions on a 100lb cylinder. Worked good about 2-3 hrs. then the fryer would cut off when it reached 350, the pilot would stay on. Tried turning t-stat up it would click on but no flame. Turn t-stat off let it cool down for about 5-10 min. and turn it back on worked good until it reached temp. If you turn t-stat to 400 it will stay on longer time, but when temp. reached same problem. What could be the problem?

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You could have a weak pilot or thermopile. If the thermopile is not heated correctly by the pilot, it cannot generate enough millivolts to open the gas valve. The same is true if the thermopile is faulty. Thermopiles consist of several junctions of which only some may go bad causing low millivolt output. Millivolt output with the thermostat off and pilot lit should be around 600 millivolt, you can check with a DC multimeter set on MV across the two wires coming from the thermopile. Remember, the thermopile has to be heated by the pilot thoroughly before you will get the full millivolt reading and the thermostat must be off. Cleaning the pilot assembly is often helpful, thermopiles are inexpensive and relatively easy to change. Of course, other problems can cause this issue as well, but the above are most common.

Posted on Apr 23, 2014


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