Carrier Exhaust Odor


Old 01-22-05, 06:57 PM
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Question Carrier Exhaust Odor

My Carrier Hi-Efficiency furnace exhaust has a strange odor. I noticed this about one week ago. It smells like the natural gas is not completely burning. However, furnace operations is normal and house is heating ok. No odor in the living area, although there I can detect a faint odor when I opended the front of the furnace. Flames appear blue/normal -- no yellow. Any suggestions that you have for what I might be able to check to diagnose this problem?
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Old 01-22-05, 07:24 PM
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So you are saying that outdoors at the exaust you smell raw gas? If so call the gas company and they will check it with a combustible leak detector. Don't mess around with raw gas.
Old 01-22-05, 08:31 PM
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Not exaclty raw gas

It does not smell like raw gas -- mor like carbon and it looks like inside of white exhaust pipe is getting a slight carbon coating. My guess is that it is not burning properly, but blue flame in combustion chamber looks normal. Is there a way to adjust the burners?
Old 01-24-05, 08:07 PM
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Someone told me it might be a clogged condensation line. Basically, the condensation is not draining well enough from the intake manifold, causing a restriction in the amount of air getting to the combustion chamber. This is causing the carbon smell. Seems to make sense since I have the same carbon odor in the condensation pump pipe outlet. I am going to try it when it warms up later this week (it is 8 degrees F outside right now) and I Don't want to put furnace out of commission for an hour while I clean drains. I will post back here to let you know if this was the culprit. Anyone else had a similar experience?
Old 01-02-07, 09:21 AM
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Exhaust Odor Carrier Weathermaker

I noticed a couple of postings regarding exhaust odor that is NOT natural gas. I am experiencing this at my home as well. The exhaust odor is on the outside and it is more offensive the harder that the furnace operates - i.e. in trying to reach higher temperatures in the house the odor gets worse outside. I can now smell it around the exterior of the house... NOT just at the exhaust pipe. Any suggestions on how to remedy the situation? I've had a trained HVAC company come out and look at it and they are also perplexed. Thanks for your help.
Old 01-02-07, 09:25 AM
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Exhaust odor

I noticed your posting regarding your exhaust odor and was wondering how you resolved it. I'm having the same problem with a Carrier Weathermaker furnace on natural gas. Any suggestions appreciated.
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Old 01-02-07, 03:36 PM
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I have to ask, when was the last time these units weree professionaly serviced? The condenate drains may be backing up, but also they may have partial obstructions in the combustion air inlets.

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