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Discussion Starter · #1 ·
I have a american 2 stage furnace # ud100r936a. The house doesn't reach proper temp.The unit seems to cut off early. I have a new thermostat,new ignitor,cleaned flame sensor and burners are clean. Also the control board flashes 2 times and I need to turn the power on and off to reset. Can it be a bad gas valve?
 

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Discussion Starter · #3 ·
I'm not really sure. This morning the the thermostat was calling for heat and the furnace was off.The control panel was 2 flashes {lock out mode}.I turn the power on ,then off and unit started just flashing.The ignitor started to glow and it seems like no gas was present to start the furnace.So I tapped on the gas valve ,hear a click and the unit fired up.
 
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