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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 Robert, Pickering on Twintech Heating and Cooling

Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.

by Brian Burns, Whitby on Twintech Heating and Cooling

The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.

by Geoff, Port Perry on Twintech Heating and Cooling

Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldn’t believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!

by MB, Ajax on Twintech Heating and Cooling

Installation was done quickly and professionally. The new furnace is quiet and provides even heat.

by Richard from Oshawa on Twintech Heating and Cooling

They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!

by Darcy from Pickering on Twintech Heating and Cooling

This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!

by gillian hooton from Uxbridge on Twintech Heating and Cooling

Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.

by dflynn in Ajax on Twintech Heating and Cooling

Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.

by alisiena from Toronto on Twintech Heating and Cooling

Fantastic team. Completed the job as per the specifications and in under 3 hours. Highly recommended Twintech.

by David from Toronto on Twintech Heating and Cooling

During the summer, I previously hired TwinTech to replace my air conditioner when it failed. They did an excellent job so when I decided to proactively replace the furnace I contacted them. The furnace I had was 22 years old and showed signs of internal leakage. It still worked but rather than wait to have it fail in cold weather, I decided to purchase a higher efficiency model before it failed and take advantage of energy efficiency rebates. TwinTech offered very useful advice on the make and model of furnace to choose including high efficiency and variable speed motor. The price was reasonable, TwinTech arrived at the allotted time, installed the new furnace (including some re-routing of exhaust lines since the existing ones were too close to other vents), removed the old furnace, tested the installation and cleaned everything up. Overall, it was a good experience, they did a great job and the new furnace is working well.

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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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