Sounds like a low voltage(24 volt) problem. Make sure panels on furnace are in place and tight,especially one you remove to chande filter. If you don't know which wires/connections are 24/120/240,set your meter to 250 or higher to prevent damage in the event a mistake is made. Start with transformer,24v out? No? Transformer is marked for primary,normaly 240v,do you have 240v? No? Check furnace breaker and/or power coming into furnace. Got 240 into transform but less than 20 out? Replace transformer. All is well with transform? Set t-stat for fan ON and examine/jiggle low volt wires at t-stat and furnace to see if one is loose/broke. That is about as far as a diyer can go on his own. You will need to call a tech or have someone go with you one step at a time.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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