I was vacuuming up water from my basement I assumed was from the rain, suddenly water started spraying out of a blue pump at the base of my furnace, don't know what the pump does or why its spraying but its making an awful mess.
Blue pump, usually found on the floor near the furnace (sometimes mounted where plenum meets the furnace frame) is a condensate pump. One of the products of combustion is water. This water is drained from the ventor motor (a motor which runs and sets a artificial draft inside the combustion chamber) to a drain nearby or a electric pump which then pumps the water over a longer distance to a remote drain. If the pump's discharge outlet gets plugged from dirt the result is usually the mess you see. Remove the cover plate of the pump housing, clean it out and run a wire with a small rag attached as a snake through the tube to drain. There is usually some type of float switch inside the pump housing so make sure it is free to move. Check for operation by pouring some tap water in it and move the float switch to on (up) One final note and this is very important. If the pump or tube to drain is filled up with a crud that resembles paste, call your local trusted HVAC tech for furnace service. This condition can be an early sign of heat exchanger failure and is a major safety concern for your family
