Need help with ductless mini split odor

[joecalv]

I installed a Daikin Inverter mini split with 2 heat pumps and 7 indoor air handlers. The system works great however the homeowner has been complaining of an exhaust/ urine smell from 2 of the units. It is an eickler home. I have talked to many people both from daikin and other suppliers and specialist and I have pretty much checked of all of what they told me to look for- not draining correctly ( it is draining good)
- refridgerant leak ( not leaking)
- odor in room ( it is a cleaned daily).

The strangest thing is that the homeowner says that the unit only smells at the hottest point of the day when the unit has to work at it's hardest .

I have a daikin rep out to look at it but he says he has never heard of this problem.

Has anyone every had this issue before of have any ideas what it could be? Also I just cleaned the unit in question and it made no difference.

[idruthrbfishin]

Check the fan wheel and the back side of the evaporator. I have seen some pretty funky stuff growing on some of these units even if there is only a small amount of humidity in the room. Sometimes you actually have to remove the fan wheel and clean it in a bucket or hose it very well. Not sure how long the unit has been in service, but sometimes it does not take long for issues to develop. Good Luck.

[joecalv]

Thanks for the reply

I only installed it 2 months ago and they said the smell who's instant after install. I did clean one of them down and I did not help. I will try to take itndown though as I am open to any recommendations.

[idruthrbfishin]

That is pretty fast to have developed a mold issue. I wonder if something might have gotten spilled on it? Maybe even at the factory?

[cuchulain]

Is the hole in the wall where the lines go out behind the unit sealed up correctly. We inherited a unit where the HO was complaining of a smell, and it turned out that the original installers didn't seal the penetration and it was pulling in air from outside.

[King Ziptie]

MAybe the dog is squatting on the rug under the AH.