HVAC Condensate Pump Maintenance

In our last blog, we talked about how a leak in the home can be the result when debris can find its way into the drain lines of an HVAC system and create algae. But, a clog in the system isn’t the only way a flood can result from an HVAC operation. A failed condensate pump will also cause condensation to back up in the line and leak in the home.  If you’re handy, you may wish to undertake condensate pump maintenance yourself or you can have one of our HVAC technicians clean it during a service call or other task.

The basic structure


A condensate pump is comprised of two parts. The top contains all the working components; the bottom is merely a reservoir for the collected water.

The top has specific features such as the wiring, the discharge valve and hose, the casing for the motor, and the inlet port. There is also another port through which the reservoir bottom is visible.


A handy person can unplug the pump, disconnect the intake and drain line, and use a flathead screwdriver to open the unit at the slot on the side between the two pieces and look inside.

There are a few things to look for in the pump. The reservoir may have some dirt, algae, and debris inside. Sometimes there will even be a dead mouse or lizard. The gunk should all be cleaned out. Proper cleaning of your pump can extend its life significantly, so it’s worthwhile to do so.


The water float gauges the amount of water and relays the level to the pump to signal it to turn on. The float should move freely. The impeller basket is a round columnar shape with slots which should be clean and debris-free. The discharge valve can be removed and cleaned with a cotton swab or a small bristle cleaner.


Once the unit is clean, it should be returned to its rightful place and reconnected. Don’t forget to plug it back in; failure to do so will result in a flood once the reservoir fills up. A little water can be added to the reservoir to test the pump and make sure it’s working.


Once the pump is cleaned and reconnected, the air intake filter should be replaced. As with any appliance, a little maintenance goes a long way. These types of pumps only cost about $40, but since they run off and on all the time, it’s a good idea to keep them clean and in good working order. A homeowner will want the pump to last as long as possible since unit failure will result in the need to shut the HVAC off until the pump can be repaired or replaced.

One note of caution: since these pumps run off of 120-volt power, it’s essential to be very careful working around them if they’re turned on, and also, make sure that they’re plugged into a GFCI switch.

As always, home maintenance should be conducted with safety in mind and at your own risk. Contact your HVAC expert for service or repair in the event you’d like this task performed for you.

Call us at King Plumbing, Heating & A/C if you need plumbing installation, plumbing repairs, rooter services or AC and heating service in the Phoenix Valley area at 480-907-0226