Puddin' Man wrote:
Little bungalow in US midwest. Heil gas furnace on it's 3rd season.
Standard forced air, std install. Gen'lly works well.

heat cycle:
1.) tstat calls for heat
2.) inducer fan spins
3.) igniter element (like glow plug) heats up
4.) after about 20 sec. for 1.) and 2.), gas valve opens, burners fire
5.) safety: if heat sensor stays cold, gas valve closes.

Works OK about 2 of 3 times.

The third time, works OK thru 3.), I get a click like when the
gas valve opens, but the burners don't fire. Then it goes
back thru the cycle and works.

The igniter always heats, I can see it glowing.

Igniter's not getting hot enough? Other ideas??

Thx,
P

"Take Yo' Hand Out My Pocket (I Ain't Got Nothing What Belongs To You)!"
- Rice Miller, who probably never even _heard_ of GW Bush, Paulson, etc
Hi,
Common problem. Clean the flame sensor with emery cloth.
When flame comes on sensor generates very small amount of current
which is sensed by control board logic.