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out on safety

lakotalakota Posts: 32Member
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


  • CTOilHeatCTOilHeat Posts: 48Member
    edited December 2018
    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.

  • lakotalakota Posts: 32Member
    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
  • HVACNUTHVACNUT Posts: 2,172Member
    What type of equipment do you have?
    Has it been maintained annually?
  • DZoroDZoro Posts: 760Member
    When was last service been done?
    New filter?
    New nozzle?
    Combustion tests?
    System cleaned?
  • lakotalakota Posts: 32Member
    edited December 2018
    Colombia water boiler. Just been serviced with a combustion test done. AFII becket burner UCI power venter
  • HVACNUTHVACNUT Posts: 2,172Member
    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.
  • lchmblchmb Posts: 2,927Member
    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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