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    FRANKKINCAID's Avatar
    FRANKKINCAID Posts: 1, Reputation: 1
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    #1

    Oct 23, 2008, 02:15 PM
    Bryant Furnace Model 100-394U Won't Light Up
    My bryant furnace model 100-394u won't light up.the gas is on,the pilot is on but it still won't light. Last year I put a new hunter thermostat and it worked all winter but this year it won't start any advise
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Oct 23, 2008, 04:14 PM

    Wow,, if you got a year out of a hunter tstat,consider yourself lucky, they are junk
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #3

    Oct 23, 2008, 06:16 PM
    Check to see if you have 24v at the gas valve(when the thermostat is calling for heat). If you don't have 24v, jump from R to W on the low voltage. If no flame or 24v on the gas valve after that make sure you have a 115v to power the furnace and transformer. Make sure you put the gas valve back to on after lighting the pilot. This unit has to be around 30 years old.
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