How to Replace a Condensate Pump

Often it is best to replace an air conditioning condensate pump that has malfunctioned. While repairing a sticking float might get you through the night, the problem is bound to happen again. The cost of repairing water damage far exceeds the cost of a new pump. Take a digital photograph of the lines entering the condensate pump to double-check your installation.

Difficulty:

Moderate

Instructions

Things You'll Need

• Drain line couplings
• Wire nuts

1. Trace the wires from the pump back to the source to begin the process of turning off the power to the condensate pump. Some pumps have two sets of wires. One will be high voltage to run the motor, and the other is a low-voltage emergency shutoff to turn your air conditioner off when the pump drain pan is too full. Cut off the power to both by turning off the breaker to the air handler.

2. Pull out the drain lines that go to and from the condensate pump.

3. Disconnect the electrical lines. If the high voltage line is a plug-in, disconnect it. If it is hardwired, cut or disconnect the wire it from the air conditioner power block. The low-voltage wires are usually connected with wire nuts about 4 inches above the condensate pump. Twist off the wire nuts and untangle the wires, marking them for later identification.

4. Remove the old pump. Take care not to spill the water in it. Set the new pump in its place.

5. Reconnect the electrical lines. You can cut and slice new wires into the old ones, but it is better to run the new wires to the source. Push the drain lines back into place, either simply pushing clear flexible tubes onto the nipples or connecting copper lines with compression couplings.

6. Turn the power on and test the pump by pour watering into the pump until it turns on. The pump will run for a few seconds then shut off. Pour more water into the pump. Do this several times. Your condensate pump replacement should be ready for service.