If your furnace has a pilot light, look for the flame. Check your owner’s manual or the instructions posted inside the furnace cabinet for step-by-step lighting instructions. Usually this involves first turning the gas valve to Off and waiting a couple of minutes. Then you turn it to Pilot. Next, press and hold it down while you light the flame. Last, wait a minute or so, release it, and then turn it to On.
Any forced air system in your home - whether it is powered through electric or gas-generated energy - requires a blower motor. This component consists of an electric motor and fan, and is responsible for pushing air evenly through the furnace. As hvac.com points out, you can easily identify the blower motor in your furnace as the part that looks similar to a hamster wheel at the bottom of the unit. If it stops working, the air needed to heat your home will no longer be pushed through the furnace to be heated and distributed evenly. In that case, you need to inquire about potential repairs. Blower motor repair typically costs between $150 for a simple fix, and $450 for complete replacement and installation of the part. Where you land on that range depends on the exact damage.
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“The manufacturers that built them all agree on this; you should get it serviced once [a year] for heating and once for cooling," says Paul Mills, owner of Air Experts Heating & Cooling in Raleigh, North Carolina. "Tuning it up and checking it out is definitely recommended. Much like a car, if you ignore it, a lot more things break. You [will] extend the life of it and help prevent major breakdowns.”
When a furnace maintenance is performed a combustion analysis should be performed to identify any problems that couldn't be found by a visual inspection. You want to know what the Carbon monoxide level your furnace is producing as well as the oxygen/CO2 levels and stack temperate. The analyzer will also give you a calculated efficiency rating with the information the analyzer receives. You should have >100ppm of Carbon monoxide output during normal operation of your gas furnace. When you have higher numbers or CO numbers increasing during operation their is a problem with the furnace the technician should then find the cause of. This is just a brief explanation I'm trying to get across to those who get their furnace maintained and to those who don't! Check to see if anyone in the company has a NCI certification for carbon monoxide/combustion analysis.