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Make sure that the thermopile is receiving enough heat from the pilot and if it does, check if the hi limit is good, check and tighten also all of the wiring connections, before replacing the gas valve.
This symptom indicates something wrong with the millivolt system. Start by checking the wires from the thermopile to the gas valve, insuring they are all tight and in place. Check the hi limit thermostat, if you have an ohm meter it should read .1 or .2 across it. With you meter set to dc millivolts, and flame present on the pilot, read across the thermocouple wires (red and white) to see the millivolts generated, with the thermostat off and the gas valve in pilot position you should get approx 600 millivolt plus minus 50. The pilot will have to be on for a minute or so to get maximum millivolts. If the millivolts are correct, hi-limit closed, and all wiring is connected, you likely have a faulty gas valve. If the hi limit reads more than .1 or .2 replace the limit, if you are not getting the millivolts from the thermopile, replace it.
If a standing pilot won't stay lit, the usual cause is a bad thermocouple. The thermocouple is a safety device with a probe that is kept heated by the pilot flame and produces an electric signal. Wires from the thermocouple connect to the main gas valve. If the thermocouple fails, the main valve shuts off gas to both the pilot and main burner. When you try to re-light the pilot, it goes out again as soon as you release the pilot button on the valve.
A new thermocouple is only $10 or so, and it's pretty easy to change. There are a number of how-to sites and videos showing how to change the thermocouple in gas furnaces and water heaters, and the process is similar in commercial ovens and fryers. Once you see what the thermocouple looks like and how it's installed in some other appliances, you'll be able to identify it in your fryer and see how to change it. That should get your frying again.
Make sure the thermocouple is deeper into the flame of the pilot light. It needs to reach a high enough temperature to produce a high enough voltage to keep the pilot light lit all the time. I do not think that the main gas valve is bad at all.
there is a small adjustment screw on the gas valve,turn it clockwise to increase pilot,if that does not work the vent cap on the gas regulator on the back of the unit could be stopped up,remove that cap ,clean out or replace unit can operate without it just fine.If you increase the pilot and it still wont stay lit replace the thermocouple
Ensure that gas is getting to the pilot , or you may have a devective pressure regulator. If gas is getting to pilot and pilot is turning off, then you need to replace the thermocouple. The thermocouple function is to turn off the gas if there is not enough temperature, so to prevent gas leaks if the pilot light goes off. Near to the pilot light there
should a part similar to a small metal tube directly in contact with the flame. Thermocouple is wired back to the gas valve. When the pilot is on, and temperature is steady, the thermocouple will generate a small voltage that will keep the
gas safety valve open. In case the pilot light goes off, the thermocouple will cause the valve to close. When you hold the pilot light button , the thermocouple will normally reach enough temp to keep valve open. If the termocouple is faulty, it will turn off as soon as you release the igniter button. Replacing thermocouple is an easy repair.
Call the number listed on the owners documentation to get the replacement part.
Firstly make sure the gas knob is exactly in the pilot mode some are finiky and won't light unless in exactly the right postion. Make sure once lit when pushing down on the pilot knob that you hold it down long enough for the thermocouple to sense the pilot. Barring both of those the most likley culprit is the thermocouple itself is faulty and can easily be removed usally with a couple of screws and a small adjustable wrench.
I understand it that once the main burners go off, after the thermostat is satisfied (water heated) the pilot goes out too at the same time.
Make super sure the top of the t-couple is getting hit directly by the pilot flame. You may need to adjust the t-couples position, or even clean the pilot assemblies oriface. Double checking the connection of the coax cable at the gas valve would be a good idea too. tight but not super tight.