Hi

My heat has worked all winter, this morning it was a little cool in the house.. '
The heat is not coming on, the little fan on the exhaust pipe is coming on, the line to the
Air switch is OK, when I blow in it I can hear the switch work.. Both ends of the hose are clear..

I led light is blinking on and off fast..
Ducane gas heater
Ele start
Any ideas?/

Thank you