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Maintenance

Marine Air Conditioner Condensate Drain Cleaning

A 16k unit pulls litres of water a day out of humid air. The drain grows a slime that blocks it, and then the water goes somewhere else.

Marine Air Conditioner Condensate Drain Cleaning: Schedule and Equipment

Condensate lines are permanently damp and permanently dark, which is exactly what a biofilm wants. The tube narrows over a season until the pan overflows — usually onto a headliner or into a locker, and usually before anyone notices.

How oftenStart and middle of each season
Time20 minutes
ToolsFresh water, a length of small hose, sometimes a bottle brush
WhoOwner

Marine Air Conditioner Condensate Drain Cleaning: Procedure

    If you skip it: Water in the bilge all summer, which smells, wears out the bilge pump, and hides a real leak when you eventually have one.

    Record the date, what you found and any parts used in the boat's maintenance log. A repeat change—less water flow, faster fouling, a new smell or a breaker that trips again—is often more useful to a technician than a one-off reading. Check the current manual and official sources before changing the procedure, and stop at the licensed-work boundary described in the disclaimer.