Furnace wont heat- blower is fine and I hear a click for sparker

chillydownstairs

My gas Furnace does not have a pilot light. the blower is working fine and coordinating well with the thermostat. I hear a "click" at the right time for the gas to be fired up, but no flame comes on. what might my problem be.

Tim McElwain

Does the blower

shut off when you turn the thermostat down? If it does not then it is probably an open limit somewhere on the furnace.



I assume when you say the blower you are talking about the fan that blows heat through the house and not the combustion air blower.



When you hear the click which may be the gas valve attempting to open did you have anything else making noise before that? 

Smith19

Hot surface ignition

You've got contact/hot surface ignition if there is no pilot light on the unit. instead of a pilot, a prong will be electrically heated in the path of the gas lances until it's visibly glowing orange, and once the gas contacts this, it ignites. The hot surface ignitors go bad every so often. But when you say no pilot, does this mean your pilot's out, or the furnace has not pilot with it? The latter is what I've been talking about.





Cheers