Furnace

[Scottr]

My furnace runs for few hours turning on and off have serviced heat chamber and changed thermostat but still will decide it does not want to kick in after drops 3 degrees will drop to 58 is set at 78 . Have to fully turn off and back on for it to start to run again .

[wintertree]

Sorry about your furnace woes...does the furnace fan run for a couple of minutes.....but the furnace burner does not ignite ? Or are you getting NO life from the furnace after it drops more than 3 degrees....T- stat is a known issue at times with these units....but you say its been replaced....moving on.....have you checked total voltage available....week batteries....poor converter output can cause issues...(the furnace needs adequate power...they are power hogs)....Another thing is there is a circuit board on the exterior the furnace that many have replaced ....(I carry a spare)....but usually when it goes....your furnace just does not ignite....I believe there is some good service info online available to trouble shoot the furnace....One of the other members will have a link
Good luck