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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 Private User on Twintech Heating and Cooling

It was a refreshing experience interacting with the Twintech team. From Bob, the sales consultant, who articulated in layman's terms all the options available and reasons for making any selection. This was done without the prevailing pressure tactics so commonplace today.

Before proceeding Mitch, the technician, at our request conducted a service check on our 30 yr old furnace. His report was positive indicating no urgency to replace it. Again no pressure tactics.

Three days after first meeting with Bob, the installation team of Greg and
Spencer completed the installation within the planned time frame.

A very professional, courteous and transparent team which delivered on their promise. I highly recommend Twintech.

by Private User on Twintech Heating and Cooling

Initial contact with sales resulted in an immediate response, which led to a timely installation. Both sales and installers were all very professional. I have no hesitation in recommending TWINTECH.

by Private User on Twintech Heating and Cooling

I had a great experience with TwinTech. The company offered a reasonable quote, and performed a quick and clean installation. The installer Greg was experienced, professional and courteous. He explained the services he performed and gave recommendations on maintain the new furnace.

The salesman Bob was honest
and professional and educated me on how to achieve optimal performance.

All communication from them was quick and they came the following day. I was pleased with the service and would recommend them.

by Lousan, Ajax on Twintech Heating and Cooling

From quote, to installation, to follow up, Twintech provided excellent service. I would highly recommended their services.

by John, Pickering on Twintech Heating and Cooling

I had a really great experience with these guys. The salesman Bob was clearly very knowledgeable about everything to do with heating and cooling a home, spent a lot of time with us going over the details of the job, never rushed us and came back after the install to make sure we were happy. The installation crew was excellent, they covered the floors all the way from outside down to the basement furnace room, kept the place clean, got the work done on time and we’re very friendly. I’ve got 15 years in the contracting/ construction industry and these guys are one of the most professional company’s I’ve dealt with. Great company!

by Debra Robertson on Twintech Heating and Cooling

Had great service and clean-up was good. Was happy with my salesman. They were very friendly and helpful. I needed a new furnace as our was over 20 years old. The furnace and air-conditioner work great and they are very quiet. I am very pleased with the service and product I received.

by Private User on Twintech Heating and Cooling

Met with Dave for the sales process and he was great about explaining and going over everything to us. The install happened very quickly and the team were super professional and friendly. We are very happy with this company and their services and we definitely recommend them to others. Thankful my sister recommended them to me!

by Private User on Twintech Heating and Cooling

Reviews for Twintech were good, and they did not disappoint. After an initial visit to discuss the suitable AC unit for replacement, an installation date was available in just a couple of days, and everything was installed without a hitch. Highly recommended

by Private User on Twintech Heating and Cooling

Very pleased with the installation of our new furnace and A/C unit. From quotation stage to the completion of the job Twintech was very professional.
Thank you for a job well done.

by Darren, Pickering on Twintech Heating and Cooling

My old water heater quit on me. I called TwinTech. In less than 4 days, I had my new water heater installed and the old one taken away. The whole process was quick, easy, pleasant, and well done. This is the third time I've dealt with TwinTech and I've been satisfied each time.

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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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