Quote:
Originally Posted by Keefelane66
We have an S-tube trap (pvc) similar to a P-trap that keeps a water barrier. No insects or lizards yet 12 years
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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.