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testing a dc pilot sensor

Jim Wy.
Jim Wy. Member Posts: 43
I am working on a steam boiler w/ a standing pilot that has a thermocouple for the pilot valve and a flame sensor to prove pilot flame for the main valve. I cleaned the sensor and dont see any cracks in the ceramic yet the reset button needs to be pushed every day. Does anyone know how to test the flame sensor ?


  • Steamhead
    Steamhead Member Posts: 16,899
    If that's a flame-rectification system

    you need a micro-ammeter to measure the current flowing thru it.

    But often, these nuisance lockouts are the result of a bad ground. I often run a bare ground wire from the pilot bracket to the spark module ground connection. This bypasses the boiler chassis which sometimes doesn't ground as well as it should.

    And of course, the electrical circuit feeding the boiler should be well grounded.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • Tim McElwain
    Tim McElwain Member Posts: 4,628
    Jim Wy what kind of

    system is this, I am assuming it is a commercial boiler system? Is that correct? Give us some control numbers so we can give you correct information.
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