wrote in message


But while I can understand how pressure differences caused when the
kitchen sink runs could suck water out of the p-trap, I don't
understand:

a) how this connects to the condensate line, as I thought those were
separate from any line the kitchen sink would connect to, or
b) what exactly the smell is from, as absent a serious mold problem a
condensate line shouldn't smell like much of anything (as I understand
it).

The trap is so small it my just dry out when the AC is not being used. Dump
some water with a small amount of bleach in the pan once every week or two.
That trap is too small.