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The furnace sometimes make a loud boom and shortly later the fan starts. The repair man has been out twice and said nothing is wrong. I am afraid of a gas buildup and danger. What can be wrong or do I need a new furnace? Age 16 years old.

Post created: 2012-11-22 Type of Equipment: Furnace Views: 508

This question was created on the page: https://www.furnacecompare.com/buying_a_furnace.html.

Model is a G 20 series. I bought 12/96. The problem started this fall when I turned on the furnace. It does not make the loud bomb all the time. It seems to happens after the furnace has not run for a long period of time. like weather 70 daytime then 30's a night. It happens morning, late at night and early evening. Some days it does it and other days it does not. I had the heating co. out twice and they say all is well. nothing wrong and of course it does not do it when they are out. The utility replaced the gas meter last spring. Repair man said gas level is correct.


On 2012-11-26 Nancy wrote:

Furnace is lennox and I had no problem with it before. Does anyone have a comment or opinion?


On 2012-12-05 wrote:

I think it may be a case of expansion of the duck work when it heats up and cools off.


On 2012-12-06 Nancy wrote:

Thanks for the suggestion. I really appreciate it. I had a second opinion from another heating company after the latest loud bang and smell of gas. For safety I decided to replace the furnace. It felt that it was better to replace the furnace rather than spend $1000.00 for repair and replacement of the heat exchanger which was under warranty. After the last bang, the heat exchanger developed a crack. My peace of mind and restful sleep was worth it. I know that furnaces have many build in safeguards, but I did not want to take the risk of loss of life or property.


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