furnance

bo57ford wrote:
went on a week end trip
turned on the furnace work for about 5 to 10 min with heat
then no heat
I hear the ingnator sparking but dose not light
gas bottles ful stove works
any help i would be thankful
suburan furnance

First check to make sure there isn't a valve closed at the furnace. If no valve closed, check to see if the regulator vent hole is plugged / blocked by debris. Finally, can you see a flame when it is sparking? If you see a flame for the entire time the ignition is on, but then it shuts off... you will need to clean or replace the flame sensor. it will be directly in the pilot flame. Attempt to sand it first, and try again. Some slight bending or adjustment might be needed to get it properly into the flame.

Considering that the furnace attempts to light, it is not an electrical issue and is not a thermostat issue. Either the furnace has no propane, or it is actually lighting and the furnace safety circuit does not sense the flame.