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How to clean out a 90% high-efficiency furnace’s condensate drain line properly


Problem: My furnace will not start. My high-efficiency furnace’s control board is flashing a code that shows the furnace’s pressure switch is open.  There is water on the floor around my gas furnace. What could be the problem with my furnace? Is the condensate line on my furnace stopped up? How do I clean the condensate line on my furnace without damaging the pressure switch or other parts inside the furnace?

Answer: We have many people who have high-efficiency furnaces that either leak water in the wintertime or the condensate drain line stops up and causes pressure switch problems. If the blink code on your furnace is showing a pressure switch fault then you might have a stopped-up furnace condensate line. The blink code is the blink code (number of LED flashes) on the furnace’s control board. The blink code key most of the time is found on the furnace’s blower door or access door. If you have a 90% high-efficiency furnace that produces water in the wintertime then we have an excellent YouTube video below made by AC Service Tech that shows how to properly clean out the condensate drain line. Thanks so much to AC Service Tech for making this excellent video! We have condensate traps and condensate line drain kits on the following page: Please click here if you are interested in seeing the various furnace condensate traps and condensate line repair kits that we sell.

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