How do I test a condensate pump?

Testing a residential HVAC condensate pump to ensure it is functioning correctly involves a simple manual water test. First, verify that the pump's power cord is plugged securely into a working wall outlet and that your air conditioning system is operating normally. Second, take a cup of clean tap water and pour it slowly and directly into the pump's plastic collection reservoir tank until the water level rises significantly. Third, observe the internal plastic float arm as the water level climbs; it should float upward and trigger the electrical switch, causing the motor to kick on instantly. You can troubleshoot electrical power using a multimeter if it fails to engage. You can verify that the pump is fully operational when the motor drains the reservoir tank completely in a few seconds and shuts off quietly.