Question about Imperial IFS40 Deep Fryer

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Ifs40 w/ new thermopile

Bought a new thermopile because pilot wouldnt stay lit...Now pilot will light but when I turn it on and it reaches temp.(tested at 200'f) the burners shut down correctly but 1/2 second later so does the Pilot, almost as if a safety trips and you can't relight the pilot for an extended period of time afterwards...Checked for leaks and found none..help???

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  • 4 more comments 
  • Iraj Sharifikhah
    Iraj Sharifikhah Jun 11, 2008

    when I turn it on after 20 second it turn back off even pilot it is s40

  • Anonymous Jun 15, 2008

    Same Problem

  • usmani Jun 21, 2008

    The pilot does not stay lit.

  • debndave73 Jul 11, 2008

    replaced the thermopile and everything goes out after onr cycle

  • Anonymous Oct 18, 2008

    Pilot wont stay lit. Pilot will
    light but when I turn it on and it reaches temp. the
    burners shut down correctly but 1/2 second later so does the Pilot,
    almost as if a safety trips and you can't relight the pilot for an
    extended period of time afterwards.

  • amergy Oct 18, 2008

    Pilot wont stay lit. Pilot will light but when I turn it on
    and it reaches temp. the burners shut down correctly but 1/2 second later so
    does the Pilot, almost as if a safety trips and you can't relight the pilot for
    an extended period of time afterwards.




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  • 68 Answers

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?

Posted on May 31, 2008

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1 Answer

Fryer cut off but pilot stays on


You could have a weak pilot or thermopile. If the thermopile is not heated correctly by the pilot, it cannot generate enough millivolts to open the gas valve. The same is true if the thermopile is faulty. Thermopiles consist of several junctions of which only some may go bad causing low millivolt output. Millivolt output with the thermostat off and pilot lit should be around 600 millivolt, you can check with a DC multimeter set on MV across the two wires coming from the thermopile. Remember, the thermopile has to be heated by the pilot thoroughly before you will get the full millivolt reading and the thermostat must be off. Cleaning the pilot assembly is often helpful, thermopiles are inexpensive and relatively easy to change. Of course, other problems can cause this issue as well, but the above are most common.

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Hi there.
Try cleaning the thermopile (cylindrical piece of metal behind the pilot) wwith a non-metal scrubbing pad. thermopile needs the heat of pilot flame to keep the pilot flame lighted as well as burners during operation.
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