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Quick Troubleshooting Guide for Furnace Issues

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Quick Troubleshooting Guide for Furnace Issues

Posted On: December 9, 2024

Quick Troubleshooting Guide for Furnace Issues

A malfunctioning furnace can be a major inconvenience, especially during colder months. Below is a simple guide to help identify and potentially resolve common furnace issues before calling a professional.



1. Furnace Won’t Turn On

  • Check the Thermostat: Ensure it’s set to “Heat” and the temperature is set higher than the room temperature.
  • Power Supply: Verify that the furnace is receiving power. Check the circuit breaker and reset it if necessary.
  • Pilot Light or Ignition System: For older models, ensure the pilot light is lit. Modern furnaces might have electronic ignitions, which may need resetting.

2. Weak or No Airflow

  • Check the Air Filter: A clogged filter can restrict airflow. Replace the filter if it’s dirty.
  • Inspect the Blower Motor: Ensure the blower motor is functioning. Listen for unusual sounds or inspect the belt for damage.
  • Blocked Vents: Make sure all supply and return vents are open and unobstructed.

3. Furnace Blowing Cold Air

  • Thermostat Setting: Double-check that the thermostat is set to “Auto” and not “Fan.”
  • Pilot Light or Ignition Issue: If the pilot light is out, relight it following the manufacturer’s instructions.
  • Gas Supply: Ensure the gas valve is open and the supply is uninterrupted.

4. Frequent Cycling (Turns On and Off Repeatedly)

  • Dirty Air Filter: Replace if clogged.
  • Thermostat Placement: Ensure the thermostat is not placed near a heat source, as this can cause incorrect temperature readings.
  • Overheating: A clogged filter or dirty blower wheel might cause the system to overheat and shut down as a safety precaution.

5. Strange Noises

  • Rattling: Check for loose panels or screws and tighten them.
  • Squealing: This might indicate a worn-out blower belt or motor bearings needing lubrication or replacement.
  • Banging: Could signal a delayed ignition or ductwork expansion; consider professional inspection.

6. Furnace Leaking Water

  • Condensate Line Blockage: Ensure the condensate drain line is clear and unclog it if necessary.
  • Clogged Drain Pan: Check and empty the drain pan if it’s full.
  • Condensing Furnace Issues: Inspect the exhaust vent or condensate pump for malfunctions.

7. Furnace Not Producing Enough Heat

  • Thermostat Calibration: Ensure the thermostat is accurate and functioning correctly.
  • Dirty Burner or Heat Exchanger: Clean these components carefully or schedule professional maintenance.
  • Ductwork Issues: Check for leaks or blockages in the duct system.

When to Call a Professional

If troubleshooting doesn’t resolve the issue or if you notice signs of a more serious problem (e.g., gas smells, persistent leaks, or electrical issues), contact a certified HVAC technician immediately.


Regular maintenance and timely filter replacements can prevent many of these common issues!



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See What Our Customers Are Saying:

by Taz on Twintech Heating and Cooling

Great team of guys came to do the work. Very professional. Arrived on time worked very efficiently and were very clean. They answered any questions we had without hesitation. The air conditioner works great and is so quiet. I highly recommend them and they don't try to up-sell anything right from the start.

by Jordan on Twintech Heating and Cooling

The service was prompt, professional and very courteous. Competitive price. Would highly recommend this company.

by David on Twintech Heating and Cooling

Excellent workmanship, and quick response. Would recommend Twintech to anyone.

by Todd Whyte on Twintech Heating and Cooling

My existing 15-yr old A/C went down on me during the first major heatwave of the season. Researched my options, as well as a few different installers, and decided on Twintech.

They gave me confidence right from the beginning. Extremely knowledgeable. Their communication was excellent - always responded to questions quickly. Given we were in a heatwave, they were fully booked. However, within days they were able to fit me in due to a cancellation. Upon learning that the Amana unit I was getting installed was on backorder, TwinTech went to bat for me with the manufacturer and was able to get me the next model up within a day, for the same price - Amazing!

As far as the installation was concerned, I couldn’t be more impressed. These guys were clearly very experienced and did a fantastic job. Very clean, polite, timely & informative. They even thoroughly sealed all the exposed gaps in my ductwork. I’ve had plenty of heating and cooling work done in the past and have never used the same contractor twice because I’ve never been very impressed. However, from now on, I’ll always be contacting Twintech first!

by Jordan Arnott, Courtice on Twintech Heating and Cooling

They were very friendly and took care of everything. The install looks great (and works great), they were very knowledgeable. Installed our a/c efficiently despite the difficult install location both inside and outside and they made it work.

by Lori Ellis on Twintech Heating and Cooling

Phenomenal service, so glad I found these guys a few years back after being "hosed" badly by 3 other companies. I've recommended them to so many, and they all are so thankful.

by Jonathan Rogoza on Twintech Heating and Cooling

This company is fantastic. Dave came out and gave me a very honest and reasonable quote, unlike a quote received from another company. I had a bunch of questions that were easily answered and when I had questions regarding heating/cooling a previously unheated room above the Garage, Dave arranged for Greg to come out for an assessment of this new space and gave me his recommendation along with his professional thoughts on all of my options.

These guys have been nothing but Professional, honest and helpful along the way. I can't recall the two other guys doing the install, but they were great as well. Good workmanship, everything was cleaned up and everything functions as promised. I could go on and on about my experience, but it's all positive so what more could you want?

Give them a call, see for yourself. If I had to buy another furnace/AC or heat pump, they'd be my first call.

by Private User on Twintech Heating and Cooling

I hired twin tech to convert my townhouse heating from electric to gas and install a furnace and a/c unit. I had talked with many other vendors, and received several quotes, but chose them, and very happy I did. Here are some of the reasons why:
1. They were realistic about the timeline for the work, when they could start and how long it would take. (They said upfront, it was their busy season and would need to get back to me in 3 weeks, which they did):
2. They had a quote with options for me. They were clear about the entertainment of what they would and would not do (they’d build duct work, id need another contractor to box in ductwork). This allowed me to plan as I was my own general contractor for my renovations).
3. They spoke to me in a language I understood, neither too technical nor too simple. They answered all my questions as I had them. Everyone is so lovely to work with, the sales team and the contractors who are worked in my home.
4. It’s been 4 m since the work was complete. They still answer my emails and my furnace is working very well!

I unabashedly recommend! Price, customer care and quality workmanship were all amazing!

by Anna Chin, Ajax on Twintech Heating and Cooling

On one of the coldest days of winter, our furnace stopped working. Our regular furnace company came and told us we had a CO2 leak and shut us off. Their quote for a new furnace was way too high and they couldn't even install it on the same day. TwinTech was recommended to us by a friend. We called and spoke to Dave who was very nice and knowledgeable. Grant showed up a short time later and a new furnace was installed the same day with no troubles at all. Best of all, we received a higher-end furnace than what was offered by our previous company and at a cheaper price. I would recommend TwinTech with no hesitation at all.

by Hiba, Pickering on Twintech Heating and Cooling

I installed a new furnace and Air conditioner with them. The installation is of high quality and according to standards. The guys are professional and reasonably priced.. I highly recommend them.

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

by Anna Chin on Twintech Heating and Cooling

Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!

by Connor Agnew on Twintech Heating and Cooling

Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.

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