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How Can Furnace Leaks Happen?
Posted On: February 2, 2025
Furnace leaks can occur due to several reasons, often stemming from issues with condensation, internal components, or improper ventilation. Here are the most common causes:
1. Condensation Issues
- High-efficiency furnaces (with AFUE ratings of 90% or more) produce condensation as part of their heating process.
- If the condensation drain line or pump is clogged or broken, water can back up and leak.
2. Clogged or Broken Drain Line
- Standard and high-efficiency furnaces use drain lines to remove moisture.
- Blockages in these lines cause water to accumulate and eventually leak.
3. Humidifier Leaks
- If your furnace has a built-in humidifier, leaks can occur if the water line or humidifier pad becomes clogged or damaged.
4. Heat Exchanger Problems
- A cracked heat exchanger can lead to water buildup and leaks.
- This issue is serious as it can also result in carbon monoxide leaks.
5. Improper Venting
- If the vent pipes aren’t properly installed, condensation can form inside them and leak out.
6. Internal Component Issues
- Malfunctioning secondary heat exchangers or damaged seals can allow water to escape.
How to Prevent Furnace Leaks
- Schedule regular maintenance to catch issues early.
- Keep drain lines clear of debris.
- Inspect and replace the humidifier filter if necessary.
- Ensure proper venting and installation to prevent condensation buildup.
If your furnace is leaking, it’s best to turn it off and contact an HVAC professional to diagnose and fix the issue before it leads to further damage.
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See What Our Customers Are Saying:
Jan 1, 2015
My old furnace had finally broken down for the last time when contacted twintech to have a new furnace installed They were prompt, knowledgeable and very reasonably priced. They did such a great job i tell all my friends and family about this company.
Jan 1, 2015
To whom it may concern, I recently had TwinTech (Greg and Grant Dainty) replace my furnace and service both my gas fireplaces and air conditioning unit. They were professional, courteous and very fair in their pricing. I would gladly recommend TwinTech to anyone needing work done. I can be contacted at 905-626-XXXX.
Jan 1, 2015
My Fiancé and I have relied on Twintech Heating and Cooling now for the better part of the last 10 years. In that time, Greg has installed a furnace, an air conditioner, and a heat-pump at our residence in Toronto. In each instance Greg and his team were a pleasure to deal with. They were courteous and professional throughout the whole process and the quality of their work is first rate. Our experiences have always been extremely positive and we have referred his services numerous times to our friends and family. Without hesitation, I would recommend Greg and TwinTech Heating and Cooling to anyone looking to service or replace their existing heat/AC equipment
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