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Mobile home furnace, primary locks out after a minute or so

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ElderGreen
ElderGreen Member Posts: 25
Unit has a new pump, cad cell, filter, nozzle and primary control. All parts were changed a couple months ago. Unit will fire, run for a minute or so then shut off on lockout. Oil pressure fine, electrodes and nozzle good. If the fan limit switch gets readjusted a but it will sometimes fire and remain fine for a few cycles. Then inevitably it will lockout again. Switching to manual fan setting doesn't always make a difference. Any thoughts?

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  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Why were all the parts replaced? Is this a case of constant parts swapping or did an honest, truly qualified tech work on this?
    Any combustion test done? What were the readings.......including draft, and smoke. What were the ohms while running.....
    What brand, model number, nozzle size, pump pressure...
    Oh and another thing........Why were all the parts replaced?

    There was an error rendering this rich post.

  • ElderGreen
    ElderGreen Member Posts: 25
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    Parts replaced by two different techs at two different times. Cad cell and filters changed just because they were old. Pump changed because internal valve failed.