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What to Do When Your Furnace Starts Leaking

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What to Do When Your Furnace Starts Leaking

Posted On: January 23, 2025

What to Do When Your Furnace Starts Leaking

A leaking furnace can be a concerning issue, but addressing it promptly can help prevent further damage to your home or HVAC system. Here’s what to do if your furnace starts leaking:



1. Turn Off the Furnace

  • Safety First: Shut off the furnace to avoid electrical hazards or additional damage.
  • Locate the power switch near the furnace or turn it off at the circuit breaker.

2. Check the Source of the Leak

  • Condensation Issues: Modern high-efficiency furnaces (with an AFUE rating of 90% or higher) produce condensation. If the drainage system for this condensation is clogged or broken, it can lead to leaks.
  • Humidifier Leak: If your furnace is equipped with a built-in humidifier, it could be the source of the leak if there's a clog or crack in the water line.
  • Internal Components: Older furnaces or mid-efficiency models that don’t produce condensation may have issues like leaking heat exchangers.

3. Inspect the Drain Lines and Pan

  • Check the condensate drain line for clogs or cracks. Over time, debris can block the line, causing water to back up and leak.
  • Examine the drain pan beneath the furnace. If it’s cracked or full, it could be the cause of the leak.

4. Clear Any Clogs

  • Use a wet/dry vacuum or a thin wire to clear out any blockages in the condensate drain line.
  • Clean the drain pan and ensure it’s properly positioned.

5. Tighten Connections

  • If the issue is related to loose hoses or pipes in the furnace, tighten the connections securely to stop the leakage.

6. Address the Humidifier

  • Inspect the humidifier water lines for cracks or blockages and replace damaged components if necessary.

7. Call a Professional

  • If you cannot determine the source of the leak, or if the issue persists, contact an HVAC technician to assess and repair the problem. Delaying professional help can lead to more costly repairs or damage to your home.

8. Prevent Future Leaks

  • Regular Maintenance: Schedule annual furnace inspections and tune-ups to ensure everything is functioning properly.
  • Keep Drain Lines Clear: Periodically clean and inspect the condensate line and pan to prevent buildup.
  • Replace Air Filters: Dirty filters can reduce airflow, causing condensation to accumulate where it shouldn’t.

By addressing the leak early, you can avoid potential damage and ensure your furnace continues operating efficiently.



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See What Our Customers Are Saying:

by John from Toronto on Twintech Heating and Cooling

Our furnace bit the dust, and Twintech came out to troubleshoot and diagnose the problem within a couple of hours. Mitch was super helpful, patient, and answered all of our questions. When we decided to get the furnace replaced, the crew was over first thing the next morning and did a fantastic job. Not only did they complete the job in a few hours, but they cleaned up and respected our house as they went, and answered all of our follow-up questions. I've used Twintech for our HVAC needs in the past and will continue to do so. I'd recommend them to anyone, and it feels good to support a local, family-owned business.

by Ryan k on Twintech Heating and Cooling

Dave and the Twintech team were fabulous from day 1 and helped us through the process to identifying a new furnace and AC unit. This was our first time through this process and Dave did a thorough job explaining all the components and was very patience answering all our questions. Dave provided great insights and fair pricing.

The Twintech team did an awesome installation. Very clean and efficient. I would highly recommended their service.

by Louise in Scarborough on Twintech Heating and Cooling

We had a new Amana furnace installed by Twintech and we were very pleased with the installation. It is nice to have a warm house again.

by Private User on Twintech Heating and Cooling

Excellent job. Excellent service. Competitive price. Its rare to find a company with the knowledge and professional results we have experienced with Twintech. The clean and neat installation with attention to detail and drop sheers to respect our property is a clear indication of Twintechs high level of integrity. The 1-1/2 gas line upgrade they did for our pool 3 years ago was awesome. Can't say enough. Thank-you Twintech.

by Private User on Twintech Heating and Cooling

Twitch did a great job with the installation of our new furnace. I really appreciated their honesty and I could trust what they were telling me. Another company tried to suggest significantly more work at a greater cost claiming it was necessary to meet current building code. Twintech is very fair. All staff I meet were friendly, polite and trustworthy. I would recommend Twitch for a furnace.

by Private User on Twintech Heating and Cooling

This is a professional team that's easy to deal with. I would strongly recommend them

by hj.taggart in OSHAWA on Twintech Heating and Cooling

Very professional firm from start to finish!
They removed the old oil tank and furnace. They installed air conditioning and a new propane furnace.
Professional installation, on time and no mess.
Very pleased with their work and would highly recommend the company. Our house is three stories so they spent the time to do all the calculations to make sure we would have great performance on each floor.
Thank you again!

by susieschoeppler in Oshawa on Twintech Heating and Cooling

Upon a routine yearly maintenance, it was discovered there was a leak in the heat exchanger and a I needed a new furnace. I know nothing about these things and was completely stressed out. The company I had the maintenance plan with quoted me a huge number to rent a furnace, I just wanted to cry. Then I spoke to Dave at Twintech. He was so knowledgeable and calming, provided me a fair quote and within a few days I had an amazing crew show up to my house and install my new energy efficient furnace! I have already recommended these wonderful people at Twintech to a good friend of mine. Thank you Twintech!!

by Private User on Twintech Heating and Cooling

Great service and great people to deal with, from sales to installer. I highly recommend this company.

by GR from Oshawa on Twintech Heating and Cooling

Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!

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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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