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Greg Jenkins
10-02-2007, 07:16 PM
Can anyone tell me why I heard gurgling from the condensate drain line (at the furnace) while the furnace was in operation. It was similar to the sound you get if you blow through a straw into a glass of water.

Billy Stephens
10-02-2007, 08:33 PM
Greg,

Restricted drain with no P trap.

Jerry Peck
10-03-2007, 07:30 PM
Restricted drain with no P trap.

Or ... insufficient trap depth which is allowing the pressure in the unit to overcome the trap depth.