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2

Of course you can do nothing but change the filters but that will affect the reliability and service life of the unit. There is more to these things than just a filter. A furnace service usually includes a cleaning of the blower motor, an inspection of the burner and housing for any cracks or leaks (a HUGE safety concern!), inspection of the ignition system,...


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So you have two C terminals on the control board? I see a blue wire on one of the C terminals and then a red wire on the C terminal next to it. The red wire goes to the outside unit to make it turn on and off, so that one should have power for sure. If you don't have a multimeter, you can just move the blue wire to be with the red on the other C terminal. ...


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Changing the filter is a must and good for you for doing it. There are things that must be done to extend the life and efficiency of your furnace. Most important is cleaning the burners and checking the blower motor. Most are direct drive so they don't have belts but they can and do get real dirty. The blower blades have to be cleaned too. They will also ...


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