Do not try to do DIY gas furnace maintenance or tune-ups yourself. In addition to being dangerous, this may also violate the manufacturer’s warranty. Let properly trained and experienced technical staff perform all gas furnace preventative maintenance. Regardless of your DIY talent, trying DIY furnace maintenance is fraught with hazards and risks to your heating system—and yourself.
Next check and clean the furnace’s flame sensor. The video below shows you how—note that this guy fixes it in about 5 minutes. We would probably use a little bit of emory paper, but he cleans the sensor with a 5-dollar bill. Another video further down the page under the discussion of “If your furnace keeps shutting off after about 5 minutes” shows the same project with a different brand of furnace.
The installation and maintenance specialists from Nerthling's Heating and Air Conditioning are accredited by the manufacturer, having been extensively trained to correctly size and install ductless systems.  We are uniquely qualified to recommend, design, and service state-of-the-art systems.  Through knowledgeable and accurate workmanship, you’re ensured the highest level of rewards from your ductless system.
The best defense against the brutal heat and stifling humidity of Cohoes area summers is the convenient and affordable luxury of an air-conditioned home. Modern advancements in cooling technology have significantly improved performance, moisture control and longevity, while minimizing energy consumption, making this an ideal time to invest in refreshingly cool comfort for your home. Trained to perform safe and efficient installations that are always done perfectly, Choice Heating & Cooling technicians maximize reward and reliability, while minimizing energy costs and sound levels.
For over 25 years, Choice Heating & Cooling has continued to serve the comfort needs of homeowners in Cohoes and the surrounding neighborhoods of Cohoes, Troy, East Greenbush, Clifton Park, Schenectady & Albany, NY.  We are familiar with local climate, energy costs and the concerns that come from drastic swings in temperature.  Around here, home comfort is a year round challenge.  Rest assured, Choice Heating & Cooling provides the innovative products and expert technicians to handle the brutal winter cold, scorching summer heat, and everything in-between.
Before performing DIY furnace maintenance, Richard makes sure to switch off the electrical power and the fuel supply. The distinctive red power switchplate can usually be found at the top of the cellar stairs or near the burner itself, while the fuel shutoff valve is near the oil tank or on the incoming gas pipe. Note the location of both in case of a future leak or fire.

Turn off the gas supply valve, typically located by your gas meter on the gas inlet pipe. Turn off the gas by rotating the valve one quarter turn with an adjustable wrench. When the gas is off,  the valve’s oblong stem points perpendicular to the inlet pipe. Then call your gas utility or the fire department from a remote location. Do not return to your home until you know it is safe.
At Genz-Ryan, we are here for you 24 hours a day, 7 days a week so you can count on us for all your heating repair work in the Minneapolis area. Our furnace repair technicians are well-trained and experienced. They’re ready to take care of any heating issue that you may have. We are a Lennox Premier Furnace Dealer and provide expert furnace repair service for most of the Minneapolis/St. Paul area. For over 60 years we have been getting the job done right the first time.

Furnace tune ups should take anywhere from 45 minutes to hour and a half, depending on what the technician has to deal with when he gets there. I was a heating and AC professional for over 10 years and I had tune ups that only took me 30 minutes, and others where it seemed like I had to practically disassemble the entire furnace, clean, then put back together. Every call is unique. However, it's important you trust your contractor. Your instincts are more accurate than you probably give yourself credit for. I don't remember a tune up ever going less than a 1/2 hr in my 10 years of experience. It just takes time to setup, take down, and perform the actual maintenance. If you figure a minute per inspection point, it should have at least taken half an hr. I've showed up to furnaces that look flawless, and I still take them apart and clean them because that's what the homeowner paid me for. If there is even a hint of a cracked heat exchanger, get a second opinion. There are scams out there, and unfortunately a 20 minute inspection wouldn't reveal that. Have whomever is making the claim show you via camera or by physically removing the combustion chamber from the furnace and showing you. As weird as that sounds, I've removed heat exchangers out of furnaces just to prove that there was an issue. A cracked combustion chamber can be a serious issue, so the fact that he said it should be fine says either he doesn't know what he's doing or he's not being truthful, or both. It's not that cracked heat exchangers are leaking carbon monoxide, it's that they can. It's the potential that makes it dangerous. Hope this helps!

Furnace tune ups should take anywhere from 45 minutes to hour and a half, depending on what the technician has to deal with when he gets there. I was a heating and AC professional for over 10 years and I had tune ups that only took me 30 minutes, and others where it seemed like I had to practically disassemble the entire furnace, clean, then put back together. Every call is unique. However, it's important you trust your contractor. Your instincts are more accurate than you probably give yourself credit for. I don't remember a tune up ever going less than a 1/2 hr in my 10 years of experience. It just takes time to setup, take down, and perform the actual maintenance. If you figure a minute per inspection point, it should have at least taken half an hr. I've showed up to furnaces that look flawless, and I still take them apart and clean them because that's what the homeowner paid me for. If there is even a hint of a cracked heat exchanger, get a second opinion. There are scams out there, and unfortunately a 20 minute inspection wouldn't reveal that. Have whomever is making the claim show you via camera or by physically removing the combustion chamber from the furnace and showing you. As weird as that sounds, I've removed heat exchangers out of furnaces just to prove that there was an issue. A cracked combustion chamber can be a serious issue, so the fact that he said it should be fine says either he doesn't know what he's doing or he's not being truthful, or both. It's not that cracked heat exchangers are leaking carbon monoxide, it's that they can. It's the potential that makes it dangerous. Hope this helps!


The thermocouple is a copper rod that the pilot flame heats-up. When it gets hot enough, the thermocouple signals that there is enough heat to burn the gas fuel being released into the appliance—and so it allows the gas to be released to the burners. In some cases where the pilot light won’t stay lit, the thermocouple needs to be adjusted or replaced. This is generally a job for a professional.

Thornton, CO residents trust in Marky Mark's Heating, Cooling & Plumbing, LLC for all of their heating and air conditioning service needs. Contact our heating company for furnace installation and furnace repair, as well as a range of air conditioning and plumbing services. Our team of technicians specializes in indoor comfort solutions. Call anytime! Learn more…
We are open from 7am to 10pm every weekday and from 7am to 8pm on weekends. We book appointments in a 2 hour arrival window and call 30-45 mins before we arrive so you do not have to sit around waiting. It is often possible to schedule your appointment in the evening or morning hours to avoid conflicting with your work schedule. Are you looking for service today? Give us a call or click on one of the Schedule Service buttons found on the top and left sides of this page to contact us today.

We asked This Old House plumbing and heating expert Richard Trethewey to show us the proper steps that a service professional would follow for an oil-burning forced-air furnace; the basics on a gas system are similar. In both, fuel is mixed with air and ignited, heating a sealed chamber. Fresh, filtered air then blows across the outside of the hot chamber and into the heating ducts. (Homes with radiators have boilers instead of furnaces. These heat water instead of air, but the annual checkup is similar.) In all, the dangerous exhaust from the combustion chamber is vented out a flue or chimney.

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