An air conditioner contactor is an essential electrical component within your AC unit that controls the flow of electricity. Acting as a switch, the contactor either allows or blocks electrical current to the system based on signals from the thermostat. When you turn off your air conditioner, the contactor lifts, cutting off the electricity. Conversely, when you turn on the AC, the contactor lowers, permitting electricity to power the system.

Function

The contactor plays a crucial role in the operation of an air conditioner. Here’s how it works:

1. Thermostat Signal: When the thermostat senses that the room needs cooling, it sends a signal to the contactor.
2. Closing the Circuit: Upon receiving this signal, the contactor closes, allowing electricity to flow through the circuit and power the AC unit.
3. Cooling Activation: The compressor and condenser fan motor are then activated, initiating the cooling process.
4. Temperature Regulation: Once the desired room temperature is achieved, the thermostat signals the contactor to open, cutting off the electricity supply and turning off the AC unit.

The contactor is vital for the safe and efficient operation of your air conditioner. Here are some signs that your contactor might be malfunctioning:

• Buzzing: A loud buzzing noise at the start of a cooling cycle could indicate burned-out contactors. This issue might stem from debris stuck between the contactor’s arm and yoke or insufficient current flowing through the coil.
• Condenser Unit Won’t Shut Off: If the condenser unit continues running even after the AC is turned off, the contractor might have melted, preventing the system from blocking electricity.
• Humming: If the AC unit hums but fails to start, a faulty contactor could be the culprit.
• Chattering: A chattering noise from within the AC unit might also signal a bad contactor.

Understanding the role and importance of an air conditioner contactor can help you identify potential issues early and ensure your system operates efficiently. Ensuring your contactors are in good working condition is something that we at TSC Air can help you with. We have maintenance appointments available as well as maintenance plans available where we come out to your property and inspect/clean your unit(s) to make sure they are working properly. Routine maintenance is key to maintaining an efficient, long-lasting air conditioning system.