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What to Do When Your Furnace Starts Leaking
Posted On: January 23, 2025
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:
Aug 10, 2019
Professionally done and took care to cover all entry floors to the house for the installers to remove the old furnace and install a new furnace.
I also made recommendations of the tankless water heater that we had installed and items to address. We did not know they also installed tankless water heaters.
Jul 21, 2019
Price was not the cheapest nor the most expensive of my quotes. It's the quality of the installation that makes for a good AC system. The twins' knowledge & professionalism was evident in the small details:
Very clean work. Greg made sure that the refrigerant level & temperature were correct. They reinstall the insulation & vapor barrier around the wall. The outside electrical cords were secured to the wall. Proud to support this local company. Thank you.
Jun 11, 2019
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.
May 10, 2019
The service was prompt, professional and very courteous. Competitive price. Would highly recommend this company.
Jul 20, 2019
Excellent workmanship, and quick response. Would recommend Twintech to anyone.
Nov 11, 2019
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 couldnt 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. Ive had plenty of heating and cooling work done in the past and have never used the same contractor twice because Ive never been very impressed. However, from now on, Ill always be contacting Twintech first!
Jun 19, 2019
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.
Jun 12, 2019
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.
May 1, 2019
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.
Apr 16, 2019
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 (theyd 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. Its 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!
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