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Dunkirk quantum 90 not staying Lit

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wilson95
wilson95 Member Posts: 5
in Radiant Heating
I have a dunkirk quantum 90 it runs through the cycle fine then when it get to light only lights for one second then shuts off and starts the cycle over I installed a new Igniter and air flow switch I and get it to stay lit only if I put a jumper wire on the air flow switch 

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  • clammy
    clammy Member Posts: 3,111
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    if your able to get it running by jumping the air switch I would guess you have either a blockage of your exhaust or air inlet piping or a partially clogged heat exchanger . Just as a wag but I would gather that unit has a few years on it ?I do hope if your operating it w a jumper that you have a co dect in the boiler room and main living area . When was the last time the unit received a proper servicing and combustion testing ? Peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • wilson95
    wilson95 Member Posts: 5
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    My exhaust and intake pipes are clear 
  • Ironman
    Ironman Member Posts: 7,376
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    You’re condensate drain is clogged.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • wilson95
    wilson95 Member Posts: 5
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    I cleaned it out still tuning the same cycle 
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,524
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    @wilson95

    take the tubing off the air flow switch and make sure it's clean. You should have it checked and serviced.

    You either have a bad switch or something is plugged or you combustion is way off
  • Ironman
    Ironman Member Posts: 7,376
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    Did you clean the condensate trap and the sediment trap at the bottom of the exhaust pipe?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • wilson95
    wilson95 Member Posts: 5
    edited February 2022
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    Yep and I cleaned every pipe out 

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