Help! This REALLY BAD ODOR problem has been driving our family batty for months! We live in a 2-story home with a downstairs a/c zone 1 and upstairs a/c zone 2. When we turn the UPSTAIRS a/c on (it operates only the upstiars) we get a terrible odor--a cross between a dead rat and sewer smell--in our DOWNSTAIRS bathroom. The smell is only in our bathroom, no other room in the house. There is a minimal air flow in the downstairs a/c vent; nothing majort rushing out but the odor. Can anyone out there imagine why this might be? We live in a 2-year old house and this problem just started a few months ago. Please advise! Kim
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