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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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