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High limit tripping

Has anyone had a problem with a gas fired deep fryer tripping the high limit when cooking frozen fish and if so what was the cause?

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IS THERE ENOUGH OIL IN THE FRYER OIL LEVEL IS IMPORTANT.

Posted on Oct 03, 2008

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Foxtrot---i answered you last time im the hobart tech,your still having this issue?tell me exactly whats going on--we'll solve this!

Posted on Feb 23, 2008

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1 Answer

Why does the deep fryer pilot goes out


There are several possible causes of this problem, aside from a loose or damaged wire, which is uncommon. The cause in about 95% of the cases is a thermopile that has gone bad. The thermopile is the small cylinder that is attached to the pilot assembly where part of the pilot flame can contact it. It has a cable or wire going to the gas valve, high limit switch, or both. When hot enough, it produces an electrical current that keep the pilot on and allows the main gas valve to open. Be sure that you have a good pilot flame. The pilot may need to be cleaned or adjusted. The thermopile is not hard to replace in most gas fryers and not too expensive. This often starts as an intermittent problem. The second possible cause is a defective high limit. The high limit is a small rectangular device with wires going to the gas valve and a tiny stainless tube that goes through the bottom of the kettle to a sensor bulb, like the thermostat has. These are usually self resetting, but may have a small red reset button. If present check the reset. If no reset, jump the two wires and see if the fryer will now light. If so, the high limit is defective, assuming the fryer is not over temperature. If defective, replace. Do not operate the fryer in this condition as there is no over temperature protection. The next cause is if the oil is too hot, in which case the high limit will shut off both the main burner and the pilot. The pilot cannot be relit until the fryer cools down and the high limit resets. If the oil is too hot, usually over 425F, replace the thermostat. If the high limit trips when the oil is in the normal operating range, replace the high limit. The final cause is a bad gas valve. This is not too common, but the gas valve is expensive and a bit difficult to replace. Check all of the other causes first.

Jul 14, 2014 | Vulcan EF4 Deep Fryer

1 Answer

How do I jump/bypass the high limit switch?


Hi there.
Hi limits can be bypassed by connecting jumper wire from common to normally close terminals but this should only be done for testing purposes, if proven defective you have to replace it with a good one before using the unit in cooking.
Hi limit is the safety device of fryers responsible for shutting the gas valve in case oil temp reaches 450f to avoid oil from catching fire.
Regards.

Nov 22, 2013 | Pitco Frialator 35CS Deep Fryer

1 Answer

The gas come through when the oil is cold, but when the oil hat enough the gas will cut off completely even without the pilot light, i wander why this happen? please let me know!


Hi there.
The hi limit may be tripping prematurely or the thermostat has its contacts stuck heating the oil temp high enough to trip the hi limit.
Kindly check those two components.
Regards.

Sep 07, 2013 | Imperial IFS40 Deep Fryer

1 Answer

Have a fryer that i have a problem keeping lit. the reset button when oushed keeps clicking once you get it to stop the fyer will lught however only stays lit a few minutes. not sure if its that swutch or...


Unless the fryer is running at 400 degrees or higher its that switch that is bad. That is a high limit and should not trip off unless the fryer gets close to the flash point of cooking oil which is in excess of 400 degrees for most oils. If I'm not mistaken the high limit is set to trip at 450. It's also a good idea to check the temperature of the oil when its working properly. It should run at 350 and its common to see the flames go off at about 360 and then come on again around 340 to maintain an average of 350. A bad high limit is a common problem.

Aug 06, 2011 | Pitco Frialator 35CS Deep Fryer

1 Answer

Fryer is cutting out after certain temp and tripping hi limit. I replaced Hi Limit, Thermopile and Thermostat and it worked great for two days and then kicked out again, tripped Hi Limit. I'm baffled...


Hi there
Hi limit will trip at 450F.
Check your thermostat setting, then check its calibration, this way you will be able to verify where the problem is.
If the setting and calibration of the thermostat is good, check the hi limit sensing bulb, it should not touch the fire tube because if it does, it will sense high temperature and will cause premature tripping.
Regards.

Jul 11, 2011 | Pitco Frialator SG14 Deep Fryer

1 Answer

Seems like it shuts off when its gets to a certane temp have to relight pilot


Check if the oil temp does not reach 450F because if it does, it will trip the high limit device that will shut off the burner flame as well as the pilot flame. But if high limit device trips off prematurely (at temperature less than 450F) you have to replace it. Just make sure that its sensing bulb does not touch the fire tube.

Apr 25, 2011 | Pitco Frialator 35C Deep Fryer

5 Answers

Imperial cif 40 single tank bouble basket deep gas fryer


When the whole unit shuts down including the pilot light the thermocouple is not working properly. The thermocouple is what tells the gas safety valve that the pilot light is lighted. When the thermocouple fails and does not send the milli-volt (mv) signal to the gas safety valve due a failure the gas safety valve turns off the gas supply. (i.e total shut down)
If you have a handyman around you can have him disconnect the thermocouple from the gas valve control and clean the mating area in the gas valve and on the bitter end of the thermocouple. After cleaning then reconnect the thermocouple. This sometimes corrects the problem. FYI you can get a thermocouple at most any large appliance parts supply. (You will need to the know total length) It would be even better to have the old one in hand during the trip to the parts store.

Thanks for using FixYa,

Kelly

Apr 24, 2010 | Imperial IFS40 Deep Fryer

1 Answer

550 degrees and shuting down


Replace the thermostat. If it's really getting to 550F without shutting off the pilot and main burner, or the electric in an electric fryer, by tripping the high limit, replace the high limit as well. The high limit should shut off all the gas or electric at about 425F.

Feb 25, 2010 | Pitco Frialator 35CS Deep Fryer

1 Answer

It heats to 550 no matter wat


Replace the thermostat. If it's really getting to 550F without shutting off the pilot and main burner, or the electric in an electric fryer, by tripping the high limit, replace the high limit as well. The high limit should shut off all the gas or electric at about 425F.

Feb 24, 2010 | Pitco Frialator Kitchen Appliances -...

1 Answer

Imperial propane fryer won't stay lit.


check the high limit it tripping out

May 22, 2009 | Imperial IFS40 Deep Fryer

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