How to Replace a Contactor on Your AC Unit

Step-by-step guide to safely replacing a failed contactor on a central air conditioning unit. No HVAC license required for this repair.

Before starting, turn off power at the breaker and disconnect switch.

1. Take a photo of existing wiring before disconnecting anything.

2. Label each wire with tape if needed.

3. Disconnect power wires from the old contactor.

4. Remove the mounting screws holding the contactor.

5. Install the new contactor in the same position.

6. Reconnect wires matching your photo.

7. Restore power and test the unit.