The furnace fan continuing to run after turning off the thermostat is a frequent HVAC issue many homeowners can experience occasionally. Not only is this annoying, but it can also lead to problems like expensive utility costs, reduced system energy efficiency, premature breakdowns, and more. This is exactly why knowing why this problem is happening and how to fix it is essential.
Therefore, if this is something you're currently dealing with, stick around, as the team from Limcan Certified gives you the ins and outs on how to remedy this issue below.
Why Your Furnace Fan Won’t Turn Off Sometimes?
There are a lot of reasons why your furnace fan could run nonstop, as you can probably imagine, given how complex your home's heating and cooling systems are. Luckily, Limcan Certified is giving you the lowdown on what these root causes are and how you can fix them. Let's take a closer look below:
The Furnace Motor Fan Relay Isn’t Working.
- Examine the furnace fan relay for signs of flame damage or general wear and tear.
- If you notice damage on the furnace fan relay, we recommend that you seek professional assistance when handling any relay system issues.
Broken Thermostat
- Verify that the thermostat has been programmed to the desired temperature you want in your home.
- Confirm that the furnace thermostat settings and furnace fan preset are either off or on auto.
- Replace the thermostat's batteries if your thermostat display shows that the batteries are low.
Broken Fan Limit Switch on the Furnace
- Look for the furnace fan limit switch within the unit compartment. It should be near the furnace's burner element.
- Once the furnace fan limit switch has been triggered, try turning it back on from the manual setting.
- If you find that the problem has not resolved itself, consider calling a professional HVAC technician to take a closer look at your entire HVAC system.
Problems With Electrical Thermostat Wiring
All electrical problems, which are not just those related to thermostat connections, should be handled by a qualified electrician, given the inherent risks of handling electronic components without the correct qualifications and required knowledge of how to do so safely.
Breakdown of the Furnace Blower Motor Fan Relay
- Check the furnace fan relay for signs of deterioration or burn marks
- When tackling complex relay system issues like this, it's a good idea to seek assistance from a certified professional.
So, what exactly can you do beyond changing the thermostat batteries and calling a professional like Limcan Certified? We suggest attempting to shut off power to your heating system entirely and doing a complete reset.
Here is how you can go about doing so:
- Locate your furnace's power switch first. This is typically found on or close to the furnace itself. There might occasionally be an actual electrical switch on the side or bottom of the heater.
- Prior to trying to reactivate the furnace, try to let it cool down for a moment. You can turn on the power by either putting the furnace back into the socket or turning the power switch to the "On" position after a few minutes of waiting.
- Lastly, set the thermostat to the temperature you want and check to see if the furnace fan keeps running. If it does, reach out to the team to schedule a prompt repair appointment with Limcan Certified.
When to Call a Professional HVAC Technician
While homeowners can carry out some basic troubleshooting on their own, most problems call for an expert evaluation and repair, which should only be carried out by someone who is certified to do so. Here's a closer look at when it makes sense to get in touch with a reputable HVAC company like
Limcan Certified to get your furnace and thermostat working correctly to restore the heat in your home:
- Electrical issues, especially those involving relays or control boards, need to be handled by a competent technician in order to avoid any risks.
- A professional diagnosis is necessary if attempting to reset the thermostat or replace the batteries remains ineffective. A malfunctioning thermostat may indicate internal problems that a homeowner is unable or unprepared to handle themselves.
- If do-it-yourself remedies don't work to stop the furnace fan from running, a qualified technician can fix or adjust the limit switch to ensure correct functioning.
- An expert evaluation can also be required if the heat exchanger or other furnace components are having issues.
- Certain furnace components, such as the heat exchanger, thermostat wiring, or control board, may require specialized tools or diagnostic equipment that are uncommon in most houses. Professionals can identify and manage issues with these components with accuracy.
- Older furnaces or those that don't undergo regular maintenance may develop complex issues. Skilled specialists can assess the general condition of the system and recommend replacements or repairs that are required if there is no heat in your home.
Count on Limcan Certified for Customized Solutions
Are you dealing with a bad thermostat? If so, the professional and experienced HVAC team from Limcan Certified Heating and Air Conditioning is here to help. Whether your thermostat is malfunctioning or a replacement is needed, our team of certified HVAC technicians is here to help restore your indoor comfort as soon as possible.
We recognize that home heating problems can happen at any time, which is why we are available for repair and maintenance services 24/7/365 days a year, including after-hours, weekends, and holidays, at no extra cost. Limcan can also accommodate same-day repairs in emergency cases.
The experienced team at Limcan Certified Heating and Air Conditioning proudly partners with homeowners throughout Oshawa, Ajax, Clarington, Kawartha, Pickering, Port Perry, Whitby, Bowmanville, Durham Region, Peterborough, Port Hope and Uxbridge. If you live in any one of these communities, please do not hesitate to reach out to us at any time for customized, swift heating solutions for your home's furnace fan.
You can book your appointment with Limcan Certified by giving us a call directly or by booking with us online using our scheduling form. We look forward to working with you!
