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out on safety

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lakota
lakota Member Posts: 32
in Oil Heating
Boiler fires and goes through a few cycles of the aqua stat reaching temp then drops and comes back for three or four time then goes out on safety. tested transformer 10,000 volts changed oil primary Can the transformer start out OK then over heat and not put out what it should

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  • CTOilHeat
    CTOilHeat Member Posts: 56
    edited December 2018
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    Lots of reasons this can happen. Why change the primary?

    Could be oil flow/restriction, ignition, burner motor, coupling stripped and slipping, pump, poor air setting, bad cad cell, and whatever else.

  • lakota
    lakota Member Posts: 32
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    Oil flow the oil line starts out 3/8 then increases to 1/2 about 5" off of boiler. would this cause a problem Will check oil lines since the filter is at the boiler and not the tank
  • HVACNUT
    HVACNUT Member Posts: 5,834
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    What type of equipment do you have?
    Has it been maintained annually?
  • DZoro
    DZoro Member Posts: 1,048
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    When was last service been done?
    New filter?
    New nozzle?
    Combustion tests?
    System cleaned?
  • lakota
    lakota Member Posts: 32
    edited December 2018
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    Colombia water boiler. Just been serviced with a combustion test done. AFII becket burner UCI power venter
  • HVACNUT
    HVACNUT Member Posts: 5,834
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    AFII 85, 150, 6 slot, 9 slot, FBX?
    Is the correct pin inserted for your firing rate?
    What are the test results? Can you post a pic of the printout?
    The AFII is extremely temperamental as far as the air adjustment. Mainly the wheel is a POS.
    I'd like to see the O2 and excess air.
    Should have 14K volts at the igniter.
    Is there a vacuum gauge on the oil line. Repetitive cycles with a clogged oil line will run until the vacuum get too high resulting in flame loss.
  • lchmb
    lchmb Member Posts: 2,997
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    how did you test the transformer? And have you contacted whoever performed the service? It could be something as simple as air in the line but just guessing will cost more in the long run..

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