Q:

What does a clogged condensation drain do to a furnace?

A:

Quick Answer

A clogged condensation drain can trip the furnace pressure switch because it senses the accumulation of fluids in the furnace drain pan. A switch stuck in the open position prevents the furnace from turning on. Water sitting in the furnace drain pan also often contains bacteria that can create slime.

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Full Answer

The slime problem can be controlled by using special conditioner pan tablets. These slime-preventing tablets are pushed into the drain pan through the drain hole and should be used once a month. Exchanging the existing drain hose for a larger one also helps prevent clogs in the tubing. The condensation drain also needs periodic cleaning of accumulated dirt and debris.

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