Zeiler Insurance and Restaurant Insurance: Deep Fryers

Restaurant Equipment Breakdown:

Deep Fryers

For many restaurant owners deep fryers are a great asset to the business. Although many restaurants may use multiple fryers, it is not uncommon for a small restaurant to rely on just one fryer. When these fryers break-down it means trouble for the business owner. Fortunately, commercial deep fryers are generally easy to repair, and parts also pretty easy to get a hold of.

There are 4 fryer parts that commonly cause this equipment breakdown:

  1. Hi-Limit
  2. Thermopile
  3. Combination Safety Gas Valve
  4. Thermostat

Step 1: Determine the Problem


If the pilot light will not stay lit, 1 of 3 things have failed:

  1. Hi-Limit. First, check to see if the Hi-Limit is the problem by taking one wire and connecting it with the other wire. Follow your normal process and light the pilot. If the pilot remains lit, then the high limit is the problem and needs to be replaced. To replace the Hi-Limit, you first need to empty the oil form the tank. This needs to be done because the sensing bulb for the hi-limit enters through the side of the tank.  There is a large nut in the side of the tank and a smaller nut inside the large nut, loosen and pull these off.  Now you can remove the defective high limit.  Reverse the procedure to install the new hi-limit.  Always screw the larger nut into the tank first and then the smaller nut.  Light the pilot and your unit should be working.
  2. Thermopile. If the pilot still will not stay lit, then the thermopile is most likely the problem.  One end is attached to the pilot and the other is attached to the gas valve.  Remove the thermopile from both places and replace.  Light the pilot, and if it remains lit you are good to go.  Also, remember to reconnect the hi-limit wire.
  3. Combination Safety Gas Valve. If the pilot still will not stay lit, then the only thing left is the combination safety gas valve.  To replace the combo valve, you will need to have a couple of pipe wrenches.  This is the most difficult part to change, due to the limited space.  Remember to install the new gas valve in the same direction and replace all the connections.

If the pilot is lit, but the fryer still does not work, the thermostat may be faulty.  Only 3 things can happen:

1.Either the burner will not light when turned on even though the pilot is lit.

2.The oil will not get hot enough.

3.When the oil reaches temperature it will not shut off.


Thermostat. In either case the thermostat will need to be replaced.  If it is running wild (will not shut off) the oil will overheat causing the hi-limit to trip out and shut everything off.  By resetting the hi-limit and relighting the pilot and it stays lit, then you will know that the thermostat is not good.  To replace the thermostat follow the same instructions for replacing the hi-limit.

For more information on Equipment Breakdown Coverage: Click Here

If you have questions or concerns on restaurant insurance, do not hesitate to call Zeiler Insurance and speak to one of our customer service representatives. As an independent agency, Zeiler Insurance prides itself with quality customer services for the people of the Chicago-land area and the rest of the Midwest. Customer or not, we can review your insurance and see if you are being protected appropriately for the right price.

-Lucas R. Zeiler

(708) 597-5900


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