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    Vern Frahm's Avatar
    Vern Frahm Posts: 1, Reputation: 1
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    #1

    Oct 31, 2013, 08:29 PM
    Igniter comes on but burner doesn't light
    Have a Rheem 90 plus propane fired furnace. The inducer motor starts, igniter initiates, the burner does not fire. There is a short delay then igniter comes on again but burner does not light. What could be causing it.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #2

    Nov 1, 2013, 01:11 PM
    Make sure the gas valve is set to "on". If the gas & gas valve are turned on, there should be 2 wires going to the gas valve. Monitor across those 2 terminals for 24 volts AC from the time the ignitor comes on until it goes off. If you get 24 volts, the gas valve is likely bad. A double check is to use a BBQ lighter near the ignitor, again from the time the ignitor starts to glow until it shuts off.
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