Air handler musty smell

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Old 02-02-14, 04:18 PM
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Air handler musty smell

Question....I have cleaned the coils in my air handler, regularly change the filters and clean out condensate drain. I still get a slight musty smell from our unit when the fan is on. If it's set to auto and the heat is on we never smell a thing. If the emergency heat is on we never smell a thing. It's only when the fan is running without the heat or cooling on. When I remove the covers on the unit I see no mold growing anywhere, motor is perfectly clean. I do get that slight musty smell and it almost seems to me it's coming from the insulation in the unit. The unit and ductwork is only four years old. How in heck can I fix this smell and what is it? My unit and condensate pan are level and slight angled toward the drain. There is a trap. Water flows through it. I'm so confused about this smell. I tried spraying some bleach in the unit and thoroughly cleaning last summer, without any luck.
 

Last edited by Mike Schafer; 02-02-14 at 04:51 PM.
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Old 02-03-14, 06:19 AM
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You have mold in the unit most likely in the coil id clean the coil real well and treat it with something like BBJ
 
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Old 02-03-14, 08:21 AM
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I have done that, twice. It did not help.
 
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Old 02-03-14, 12:56 PM
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Your unit is located where?
 
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Old 02-03-14, 01:17 PM
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I live in MD. My unit is located in my attic which I think is part of my problem.
 
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Old 02-03-14, 01:22 PM
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I cleaned the condensate drain, which wasn't dirty with some bleach. I dumped some water in the pan inside the air handler and it drains like it should.
 
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Old 02-03-14, 01:52 PM
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If nothing in unit are duct then its got to be the coil. You say you have put chemicals for mold on the coil?
 
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Old 02-03-14, 02:12 PM
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Multiple times last summer
 
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Old 02-04-14, 06:54 AM
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Last night and this morning I noticed the smell again when the heat kicked on. After a few minutes it went away. If you think it's mold on the coil, which I can't see , what is the best product to use for removal and prevention? I don't want to use something toxic , if it can be avoided.
 
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Old 02-05-14, 01:15 PM
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What products have you used so far?

BBJ would be first choice then follow up with First strike
 
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Old 02-09-14, 11:19 AM
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I'm not sure of the name, but I bought at a HVAC supply house. It was a no rinse formula. Smelled like nasty lemons.

Thanks for the other products. I will try them out if the smell comes back.
 
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