Pilot light will not stay lit on a star 630 FF fryer

The thermal coil that tells the gas valve to stay open when the piolet light is lit is bad. Go to the hardware store with your model and serial number, they should be able to sell you a new one. They don't cost much.

Try replacing the thermocouple.

If it has a thermocouple you should check it next.

Hi there.
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.
Regards.

clean pilot light first , you may need to change thermopile or thermocouple see what mille volts you get from thermopile need 600mille volts

Hi there. Try cleaning the thermopile, it must be free of soot or any other form of dirt, the pilot flame should be of good quality, as well as the gas pressure.
Regards.

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.

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

You can not check a thermocouple by resistence. You have to check it by millivoltage when it is hot and sensing it should be above 500mv. I would be willing to bet that you have some type of particulate in the gas valve that is causing this problem.

This device actually uses a thermopile it is part number P5047541. There are two things to check here ensure that you have had the right part installed be verifying the part number and also check that the sensing end of the thermopile is directly in the path of the flame.