Pilot light won't always stay on. Replaced 1x. Lights 1 day not the next?

Discussion in 'Water Heater Forum, Tanks' started by Dsweeneyny, Apr 5, 2009.

  1. Dsweeneyny

    Dsweeneyny New Member

    Messages:
    5
    I have a new 40 gal., nat. gas AO Smith water heater. The pilot light would not stay lit so I replaced the thermocouple. Lit the first time. Goes out after 1 tank heated up. I could not relight until the next day. Once again, relit for 1 tankful only. Now will not light again. Position in pilot flame looks good. No blockage in pilot line. Pilot flame blue and steady. What next? Thanks:cool:
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    That brand is trouble. If you bought a thermocouple at blue or orange, it may not be correct for that model. The other issue is supply of combustion air...is the WH located in a closet or a small room??
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,270
    Location:
    Cave Creek, Arizona
    Water heater

    It could be the FVIR system, but they usally have to be reset if it is activated. Otherwise, there is no reason why it could not be relit immediately if it were a thermocouple problem, other than if it were getting too hot and had to cool down longer before it would work again. How new is it? If under warranty and you cannot diagnose the problem call AO Smith and have a factory warranty company check it out.
  4. Dsweeneyny

    Dsweeneyny New Member

    Messages:
    5
    Bot new T couple at orange. I'll go to a pluming supply

    Air supply is good. moved the end of the TC around in case it was not directly in the flame. No help. Hard to see while in opperation. Still under warranty. I'll call AO for warrenty if the 2nd new TC does not help. (The wife is about to blow a gasket:rolleyes:)
  5. Dsweeneyny

    Dsweeneyny New Member

    Messages:
    5
    Second TC no good either. Arrrrrgh!

    Went to local supply. Got a Honneywell. No luck. That's about all I know how to do.
  6. Dsweeneyny

    Dsweeneyny New Member

    Messages:
    5
    Gave it one last shot and it lit!!!!!!!

    :eek::eek:Don't like the color of the flame though. Should there be any yellow?
    Let's see if it stays lit after the tank gets heated up.
  7. Dsweeneyny

    Dsweeneyny New Member

    Messages:
    5
    Went out again after it heated the tank

    Any thoughts?
  8. Plumber Jim

    Plumber Jim Member

    Messages:
    92
    Is it the model with the reset button on the door? how old is the heater. were is it located? possible lint clogging the flame arrestor.
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