Residential HVAC condensate pumps fail due to several mechanical, electrical, and environmental factors over their operating lifespan. One of the most frequent causes of failure is the buildup of thick algae, mold, slime, and dust sludge inside the plastic collection reservoir, which clogs the tiny discharge tubing or jams the mechanical float switch in the "on" or "stuck" position, causing the motor to burn out from continuous running or overflow the tank. Additionally, electrical power surges, internal motor winding burnout, mechanical seal wear, and float arm breakage contribute to pump failure. You can prevent premature failure by cleaning the reservoir tank and clearing drain lines semi-annually. You can verify pump failure when testing electrical voltage confirms power is reaching the unit, but the motor refuses to run or pump water, requiring immediate replacement.
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