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Why does my Brentwood propane gas furnace come on with a bang and make a whistling noise?

Post created: 2012-11-20 Type of Equipment: Furnace Views: 257

On 2012-11-20 JB wrote:

First, propane can be a very dangerous gas to work around so do not try to fix or work on the furnace on your own. Find a licensed HVAC technician and have that person do the diagnostics and work, if indeed it does need to be fixed.

As to what may be causing the whistling, it could be that the gas pressure is too high, improperly sized parts crimping the outflow of gas, manufacturing defect of a part, or something of that nature.

The bang could be expansion of cold parts or if it is a real Bang! sort of noise it could have something to do with incorrect airflow when the gas initially ignites. The burners could also be dirty.

For both, it is really too hard to tell at a distance what is causing it so you need a trained and licensed HVAC technician. To help you find one go here: http://www.furnacecompare.com/perl/find_contractors.pl.

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl

On 2012-11-20 wrote:

I had my propane company service my furnace, he saw how the flames came on in a woof and whistled, then he cleaned the burners and replaced the thermo coupler and he said if it happens again to turn down the thermostat to stop it. The furnace seemed to self correct for a few days. Then the furnace made the bang, woof, whistle noise a few times before the pilot light went out. I had him relight my pilot light, things seemed fine, then it made the bang, woof noise and the pilot light went out again. I shut the emergency switch to off. I told my gas company I can smell a very faint gas smell with pilot light out after 2 days over the weekend. I am using wood stove as back up and waiting for gas co to call me back when they are coming. I bought new thermostat.

On 2012-11-21 wrote:

Turned out to be a leaky gas valve. The technician tried tightening the screws but gas still leaked. I am upgrading to a high efficiency condensing Thermo Pride furnace. Thank you for your quick response.

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