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Most likely the high limit is defective. This can shut down both the pilot and main burners. You can try jumping the high temp sensor leads to see if this solves the problem, assuming it is a standard Robertshaw high limit. Do this only to test, however. Bypassing the high limit can be very dangerous if the thermostat is defective or the oil level is below the sensor bulb. If your high limit has more than two wires, you may need a wiring diagram to determine which leads to jump.
sounds like the high limit is doing what it is suppose to do. Check the actual temperature of grease with a perometer and see if it matches temp on computer if it is more than 10 degrees off or fluxuates irraticly change the temp probe. If it is dead on change the high limit.
I assume it is a gas model. There are 2 thermostats. One is adjustable, you set your temp, it sounds like it has gone bad.. The second thermostat is the high limit thermostat. When it reaches 450 degrees F, it will shut down the pilot and main flame to prevent a grease fire. It may be possible that someone has hooked the thermostat up wrong. Next time you fire it up, disconnect one of the thermostat wires that has the temperature knob. If the flame goes out, the thermostat is bad,
Make sure the high limit isnt tripped. There is a red button down next to the thermostat that you push to reset the high limit. If it will not light after that it is probably a bad thermocouple - This is the sensor located in the pilot flame.
Make sure it is well positioned in the pilot flame. If not adjust it into the flame, if so replace it. They are generally available at your local hardware store because they are also used in water heaters and home furnaces. They are pretty cheap and fairly easy to change. It ususally requires that you remove one or two of the main burners for easy access. Empty the grease first just to be safe. Remove the nut from the top of the drain valve handle and remove the handle. Look to the top of the main burner or burners in front of the pilot and there are two bolts on each burner that need to be loosened (not removed) and then lift the burner to remove the bolts from the slots and pull the burner down and out. Remove and replace the sensor (should be fairly straight forward), Replace the burners and valve handle, refill with grease, and try to light it again.
When the issue starts have you actually checked the grease temperature? You can also checkto see if there is excessive grease build up on the themostat.Sometimes uncooked food particles can cause a boiling type motion in the fryer while they cook. be sure to do regular filterings of the grease,this will cut down on the suspended particles.If the grease temp is above 350, shut power off and check continuity on the thermostat,it could be sticking closed,in which case it will need to be replaced
If the pilot shuts off within seconds of the burner, I strongly suspect you are having a problem with the hi-limit circuit. Check your wiring. The slightest unwanted grounding will cause the valve to drop out.
You also need to inspect the mounting of the bulb for the high limit. Make sure it isn't covered in debris. It should be clamped close, but not touching the heat exchanger. Grease needs to be able to flow on both sides of the bulb.
You'll need to test the switch with a meter or a jumper (for TESTING ONLY!). Remember, the hi-limit switch may be doing it's job and be the symptom, not the cause. But if the switch is tripping open prematurely, you'll need to replace it. (Part# 1177) Are you testing with enough oil in the vat?