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Hello, there might be another air filter where the return air duct attaches to the furnace or inside the blower compartment.
does the furnace keep turning on and off, or do you have to do something to get it going again.
Thanks, ***** ***** temporary jumper wire across each switch in the 24v circuit until the problem ceases... it will be that last switch that needs to be replaced.
Just follow the 24v wires around to locate all of the switches.... thermostats, high temperature limit switch and any others in series with those two