Gas water heat will not fire

Discussion in 'Water Heater Forum, Tanks' started by chris989, Oct 10, 2019 at 8:27 PM.

  1. chris989

    chris989 New Member

    Joined:
    Mar 18, 2018
    Location:
    idaho
    Hello all,

    I rerouted my flue today for a State 50 gal power vented heater. Did nothing but turn the switch off. Now tonight it will not fire. The pilot is still on, never went out. The fan powers up as normal. Just no main burner.


    Is it possible the thermo coupling could go bad and the pilot stay on? In the morning I can start testing the circuits but thought someone might guide me.

    It is time to replace the unit anyway but if I can get it to run for a few bucks it buys me some time to arrange for the new install. (installed in 1991 and worked flawlessly until today)

    Thanks,
    Chris
     
  2. dj2

    dj2 In the Trades

    Joined:
    Aug 13, 2013
    Location:
    California
    Can you load a pic of the gas valve and the thermostat ?
     
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  4. chris989

    chris989 New Member

    Joined:
    Mar 18, 2018
    Location:
    idaho
    20191011_083751.jpg
     
  5. chris989

    chris989 New Member

    Joined:
    Mar 18, 2018
    Location:
    idaho
    Found it, Traced the circuits up to the exhaust pressure switch. The switch is good but there is a tiny reset button that had tripped.
     
    MASTERPLUMB777 and Reach4 like this.
  6. Master Plumber Mark

    Master Plumber Mark Sensitivity trainer and plumber of mens souls

    Joined:
    Feb 6, 2005
    Occupation:
    Sensitivity trainer.. plumber of mens souls
    Location:
    indianapolis indiana - land of the free, home of
    That is a real , real old gas power vented unit probably dating back to about 1985...

    you are extremely lucky that the unit came back on .......

    I suggest you start saving your pennies
    because its only a matter of time before that unit goes bad...
    how about a picture of the serial number on that one....

    Me and Terry could take bets on the actual age of the unit....

    my guess is 1987.....
     
  7. Dana

    Dana In the trades

    Joined:
    Jan 14, 2009
    Location:
    01609
    The original post mentioned:

    "installed in 1991 and worked flawlessly until today"

    I'm gonna go out on a limb here and bet it's 1990-1991. ;)
     
    MASTERPLUMB777 likes this.
  8. Master Plumber Mark

    Master Plumber Mark Sensitivity trainer and plumber of mens souls

    Joined:
    Feb 6, 2005
    Occupation:
    Sensitivity trainer.. plumber of mens souls
    Location:
    indianapolis indiana - land of the free, home of

    Well shoot, I did not read the whole first post,

    so you just had to go and spoil everything--

    I am willing to bet that its old stock-----
     
  9. dj2

    dj2 In the Trades

    Joined:
    Aug 13, 2013
    Location:
    California
    Do yourself a favor and replace the WH, before it gets really cold near Yellowstone.
    You got nothing to gain, but ice cold water by fiddling with it.
     
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