Quote:
Originally Posted by retiredguy123
A P-trap would not have prevented the problem that the OP described. If there is blockage in any part of the drain line, the condensate pipe and drain pan can fill with water and cause the HVAC unit to shut off.
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His son had a lizard crawl up and die blocking water flow then and vacuumed drain out.. With proper maintenance annual/semi-annual treatments vinegar or chlorine water mixture should eliminate algae from forming a screen will not prevent this only ingress of bugs/lizards. A water trap will do the same.