My HVAC system has not been meeting my expectations recently. During a scheduled cleaning and diagnostic checkup by an HVAC company, they identified that the pump was not working properly. It turned out that the condensate pump stopped working and the safety switch prevented the compressor from turning on. HVAC company wanted $250 to replace it, which was in addition to the $99 price of checkup. It's a sub $50 part that takes 5 minutes to install, so I did it myself. I had the tech bypass the pump so he could complete the diagnostic work.
Here's the write up on how to replace an HVAC condensate pump.
Here's the write up on how to replace an HVAC condensate pump.