Comments:

Theo - 2006-10-14 08:06:31
Is the unit close to a central heating vent? Our hard-wired units do that sometimes because of small particulate matter/dust blown out of the vent being judged as smoke-like. And we often notice it when the seasons change cause the airflow is routed a bit different through the ducts and stirs up the latent dust.
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Keilyn - 2006-10-14 17:29:01
PS might be able to look at it for you.
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