Technical directory · Cooling
Condensate drain blockage
A plugged line may make water appear near the furnace even though the source is the cooling system.
What to observe
Trace the observed water back to the pan, trap and drain route instead of naming the furnace by proximity.
A field example
Water on a basement floor in July suggests the cooling drain, but a humidifier line or plumbing leak can land in the same spot. Trace the upstream path before clearing the wrong tube.
What the written work should say
The technician should clear the obstruction using an appropriate method and verify drainage under operating conditions.
Where this task stops
Water can also come from a condensing furnace, plumbing or humidifier; identify the source first.