No ignition exaust fan comes on then blower comes on but does not ignite

Hiya! If your heater has a pilot, it may be out. If it has an electronic ignition, the issue could be one of a few things, including:

Low/no gas supply (Natural Gas or LP?)

Malfuntioning regulator - If you're having this issue often, it would pay to have the gas company come out and check your regulator to make sure it's not overpressurizing your house lines; the gas company usually owns the regulator, so the inspection and/or should be free

Malfunctioning electronic ignition - To check this, cut the power to your furnace and find a spot where you can get a clear point of view to the ignition tip. Turn on the heater and listen for the cycles as you watch; Fan, Blower, then you should hear the ignition start clicking as it lights the pilot. If you don't hear any clicking or don't see a small arc at the ignition tip at all, your ignition module is malfunctioning. If you do hear clicking/see arc, this probably isn't the culprit.

Good luck!

Hi Sir,

Check this page its a discussion on your same problem. I think it can help.

regards

http://ask.metafilter.com/48886/Help-me-fix-my-heater