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Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. The next time your gas furnace stops pumping out the heat, before you call in the pros, try to troubleshoot the problem yourself using this handy checklist.
If you had trouble with that one, it’s time for a quick lesson on furnace troubleshooting.
Filter-related failures are probably one of the most common furnace problems out there, primarily because homeowners forget about the filters, says Difulgentiz. Furnaces have another switch, simply known as the “furnace switch.” It’s a power switch that often looks like a regular light switch.
If you’ve flipped the furnace switch off, then back on, note the sequence of the flashing light.
Adds Bonner: “If your furnace is located in a laundry room, I would definitely service it every year, because we have chlorine and phosphates and all sorts of odd chemicals in the laundry room.
Here we provide air handler unit or blower assembly troubleshooting by expanded annotated information from the US EPA [5]who provided suggestions for investigating the air handling unit during an indoor air quality investigation. See How to determine the cooling capacity of air conditioning equipment if the system seems to be working but is inadequate to cool your building.
Is the heating combustion equipment venting properly and does it have adequate combustion air supply? Cupped fan blades can become blocked by debris: The blades of a squirrel-cage fan are cupped in order to cause the spinning cage to move air. Dirt accumulation on the blades fills-in this cupped area, ultimately changing the "cup" to a simple flat area.
Very dirty, wet, leaked-into, or rodent-infested blower compartments risk indoor air quality and health issues in buildings. The air handler unit in the photo at left needs cleaning and a check for unsafe wiring due to leaks. Mice in HVAC systems are a potential viral or bacterial hazard as well as an indicator of poor housekeeping. Notice the multiple colors and textures of mold growing on this air conditioner squirrel cage blower fan. We might find mold growing in an air conditioner on plastic, on air cabinet or duct insulation facing, hidden in fiberglass insulation, or on other materials.
Most likely the mold growing on this blower fan found a home in some of the organic constituents of common house dust: skin cells and dust mite fecals.
Very often the mold we sample and identify in air conditioner blower cabinets is a very common genera, Cladosporium sp.
The fact that the mold in this photograph includes multiple colors and textures of material suggests that more than one genera or species of mold is present.
We might, however, sample even a small amount of visible mold as part of a larger building diagnostic program if there were illness or air quality complaints associated with the building. BLOWER OPERATION: For effective operation of this system it is essential that it never be operated without air filters in place. If you permit the filters to become very dirty you may need expensive special cleaning or other repairs. ENERGY CONSERVATION: Keeping the fireplace flue closed (if you have one) when not in use will improve both heating and cooling efficiency in all buildings. Continue reading at BLOWER LEAKS, RUST & MOLD or select a topic from the More Reading links or topic ARTICLE INDEX shown below. Did you check for loose fan, bad fan bearing, or motor mounts that jiggle as the spinning components in the air handler slow down?
Of course other vibration noises might be tracked to loose duct components or blower components, even an access panel. Had a new ac unit installed and have great air flow that causes the air handler door to buckle and retract when blower starts and stops making an annoying sound.
Don it sounds as if there is inadequate return air ducting - the air handler is air-starved. I am being told that this will happen if the air conditioner is running and the heating coils have cold water in them. When conditions of moisture and temperature are favorable for molds commonly found in buildings and mechanical systems mold can grow in 24-48 hours. You'll be able to see this by following wires from the blower door safety switch back into the air handler. Replacement blower door switches are easily obtained for your air handler by brand and model via your local HVAC supplier, from the manufacturer, or often online. I add that the blower door switch is an important safety feature that helps avoid chock or chopped-off fingers or worse.
Take a look at the installation specifications for the air handler and heat pump you installed - you'll see that the manufacturer gives allowable clearance distances both for air circulation and for access to perform various maintenance and repair tasks. While the above procedure gets the job (partially) done enough to restore airflow, I'm trying to find an alternative spray cleaner that would do a better job.

My question, other than asking if you know of an alternative spray cleaner that would do a better job, is if you can offer any other better solutions.
And I agree that even a small amount of debris on the blades of a squirrel cage fan can significantly cut airflow - I've measured CFM rates before and after cleaning. If the problem were an unusual source of particulate debris in your building itself, we ought to be able to see that right on the air filter. There is a chance that a lab analysis of the air filter contents might point to an unusual particle source.
If a air handler is installed in the attic, should the unit be sealed so it doesn't suck in dust particles from attic insulation? Bill without onsite investigation we can't know for sure why water is dripping out of your room vents when the AC is run.
I'd take a look in the attic, first for obvious duct leaks or disconnections, and second at the condensate handling system. When my outside unit shuts off the attic unit continues to run and will not shut off, even after turning the whole system off the fan on the air handler unit in the attic continues to run, any ideas what this could be? In other words, if you actually turn off electrical power to the unit, for sure it has to stop running or there is a wiring or switch error.
Is it possible to run a squirrel cage blower fan with some missing blades without damaging the motor? If the noise is coming from a relay, compressor motor, fan motor, or other electrical component, shut off the system while waiting for repair. Thanks to Jon Bolton, an ASHI, FABI, and otherwise certified Florida home inspector who provided photos of failing Goodman gray flex duct in a hot attic.
Wikipedia provided background information about the definition of HEPA and airborne particle interception. If your air conditioning or heat pump system has lost its cooling capacity or won't start select one or more of the diagnostic articles listed below. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore.
Complete List of Air Conditioning & Heat Pump Design, Inspection, Repair Books at the InspectAPedia Bookstore.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.
By request of the author of this article, all links and attributes to him have been removed.
Please consider updating your browser to the latest version of Internet Explorer or Google Chrome. Here are nine easy tasks you can perform yourself, before you call in a repairman, to try and get your gas furnace—the nation’s most popular type—to start kicking out the heat again. So the first step in troubleshooting your furnace is to double-check that the thermostat is set correctly. A dirty, clogged filter limits the airflow, eventually causing heat and pressure to build up in the furnace.
If the furnace can’t get enough air through the filter, it pulls air through any opening it can. Here’s the next step in furnace troubleshooting: Go to your home’s breaker panel and look for the circuit that controls the furnace. It can be located either on the unit or—because electricians often work before the furnace is installed—on a wall nearby.
That light can not only tell you whether the furnace has power, it can flash a code to help you know what’s going on.
Any gas furnace has a “gas cock” that has to be located within six feet of the furnace, Bonner says. They get into the flame and the flame chemically changes them” and the resulting chemicals can damage the guts of the furnace, like the heat exchanger, he says. Check thermostat to see that it is calling for heat or cooling, service switches at the equipment, check fuses or circuit breakers serving the equipment; for cooling systems check for a condensate drip tray overflow switch that may have turned off the system. Are there moisture, debris, visible mold, or other contaminants (rodents, birds) in or around the air handler or blower assembly?
Clean the remainder of the fan cabinet and housing before returning the air handler to service. Carrier Model CD3BXA036000AAAA made in 1995 repeatedly blows the fuse on the control board.
Any suggestions would be appreciated, I have limited electrical knowledge, but I do have a voltage meter and can generally troubleshoot or component replace. I agree that one should look for the buzzing component: often a failing low voltage transformer or a control relay. They are very close to one another and the air must pass over both of them regardless of whether heating or cooling. The switch is connected in series between a relay in the air handler that operates the blower fan and a terminal on a control circuit board in the unit.

Be sure that your replacement switch is properly mounted so as to be reliably operated by the blower compartment door(s) - the switch opens- cuts off power - when the door is opened, and is depressed in to close and permit power to the blower when the door is properly closed. Some equipment back sides, if there are no openings or no removable panels on that side, may be permitted just inches from a wall - it depends. Mitsubishi engineers had no suggestions other than to point out that the build-up comes from pollution within my house.
Should an HVAC company inspect attic blown in insulation if the house was built before 1975?
The problem could be return air duct leaks, missing insluation, leaks into the ductwork, condensate mis-handling (if condensate can leak into nearby supply ducts), or condensate blowing into the ductwork out of the air handler because of a condensate capture and disposal problem there.
The problem, if there is one, is not so much reduced air output as that if the fan is out of balance it may destroy the fan bearings. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS. Here's an important tip: most refrigeration problems, in air conditioners, refrigerators, or freezers, are electrical, not mechanical. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Newer, more efficient furnaces are sensitive to the problem and will often shut down before a dirty filter causes more trouble. Don’t try to skimp by cleaning and reusing cheap hardware-store filters, says Mike Bonner, a heating and cooling technician and instructor with 35 years of experience who now offers helpful advice at Gray Furnace Man. They have been sprayed with an oil that catches dirt, and once saturated they are no longer effective. Sometimes those that use batteries will flash a low-battery symbol when they need a replacement, but the signal often goes unnoticed, says Bonner. Instead we'd suggest that the moldy surfaces be cleaned or non-cleanable material like insulation, replaced, and the cause for its growth corrected. I replaced the thermostat, disconnected one of the wires to the blower motor, but still have the problem. But other than humidity, there is little else that I know of to cause the build-ups as I also have supplemental filtration - Filtreat Foam covering the air intake ducts on the unit and a pair of German made, VENTA Air Wash units placed on the floor. Possibly you'll know that a balance problem is occurring by hearing or seeing vibration or wobbling when the fan runs. In air conditioning school, we used to drive out and collect abandoned refrigerators that people were tossing out during our community's spring cleanup week.
For other units, the furnace will continue to run but with less heat output and reduced efficiency, he says.
That meaning will be useful information to tell a technician if the furnace still won’t start after you replace the panels.
The squirrel cage fan can not be removed for cleaning due to problems with the installation location. Personally, I'd give it a try if it were my unit, but I cannot advise the public to do the crazy stuff I might try.
Taking these appliances back into the shop we found that almost always the problem that had caused the owner to dispose of their air conditioner or freezer was in an electrical connection or electrical control. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. He also advises to make sure the set point is at a temperature that will actually turn on the furnace. So it's worth checking out switches and controls on an air conditioner before replacing more costly components.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home.
To clean it, I 1st have to place a large plastic sheet below the unit to catch all the drippings. Carson Dunlop Associates' provides extensive home inspection education and report writing material. I then use Frost King Foaming Cleaner, which I spray directly onto the fan blades, from the bottom of the discharge vent as I manually rotate the fan. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. After letting it soak, I then flush the cleaner and dirt out with a pump spray bottle filled with vinegar. I usually have to repeat this messy endeavor 2 or 3 times to remove the majority of the dirt build-up.

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