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Thread: Pilot Light Stays Lit Yet Hot Water Does Not Come On

  1. #1
    DIY Junior Member ghatfuswow's Avatar
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    May 2012
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    Default Pilot Light Stays Lit Yet Hot Water Does Not Come On

    I have a Bradford White water heater model# MI40T6FBN with an electronic Honeywell gas control knob.

    At first, I was having issues with the pilot light not staying lit, so I went out and replaced the pilot assembly. Now that I've done this, the pilot light will stay lit, but I don't get any hot water.

    What might be wrong?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The pilot light heats up a sensor - that sensor must be properly positioned and clean to produce the signal that tells the WH it's okay to turn on the main burner. Replacing the pilot light assembly may mean the flame size or position isn't correct to heat that sensor (a thermocouple), thus, the WH thinks it is unsafe to turn on the burner. If that isn't it, it's either the thermocouple, the gas valve itself, or you didn't turn the valve to operate, and it's still on pilot.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member ghatfuswow's Avatar
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    I ended up placing a call to tech support.

    They told me to pull the cover off the combination gas valve/thermostat (there's a single screw on the lower left of the cover) to reveal three pins. I was then to measure the resistance between the center pin and the left pin and then the center pin the right pin. From there, if my reading on both measurements was not 12-13ohms, it would indicate the combination valve/thermostat is bad.

    I did do the measurement and it looks like the valve is bad; my center to right reading yielded an open.

    Now I have to figure out how to remove the combination gas valve/thermostat. Not sure how to go about it since the manual only covers removal of the White-Rogers gas valve/thermostat.
    Last edited by ghatfuswow; 12-04-2012 at 11:57 AM.

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