How To Replace The Run Capacitor In An Air Conditioner That Won't Cool

A central air conditioner starts the cooling process in the outdoor condensing unit, which receives an electrical signal from your thermostat and then kicks the compressor into action. The compressor pumps out gas refrigerant for your system fuel but needs a steady electrical current to perform this task. A run capacitor in the system helps ensure that the electricity stays steady so that the compressor doesn't overheat or kick off prematurely.

When a run capacitor starts to fail, the compressor can turn off faster than needed. You are then left with an air conditioner that won't cool your air properly. Replacing the capacitor isn't hard if you have the right tools, but you need to use caution even once the electricity is turned off because the capacitor stores a charge.

What You Need:

• Socket wrench
• Insulated screwdriver
• Digital camera (optional)
• New run capacitor

Step 1: Drain the Run Capacitor

Shut off the electricity to the condensing unit by removing the fuses from the dedicated fuse box or by turning off the circuit breaker in your home's central breaker box.

Locate the access panel on your condensing unit; the panel is usually on or near a corner. Use a socket wrench to remove the screws holding the access panel in place. Pull up and out on the access panel cover to remove it and then set the cover aside.

Locate the run capacitor and find but don't touch its terminals. Place the end of the insulated screwdriver over each terminal and leave in place for several moments to discharge the stored electricity inside the capacitor.

Step 2: Remove the Old Capacitor and Install the New Capacitor

Make a mental note of how the wires are attached to the capacitor terminals. Take a digital picture of the setup if you worry about forgetting the orientation. Pull up on each wire to detach the wire from its terminal.

Use a screwdriver to loosen the screws on the retaining strap that holds the capacitor in place. Pull the capacitor free of the strap.

Insert the new run capacitor into the strap and then secure the screws on the strap. Hook the wires up to the appropriate terminals on the capacitor using your picture as a guide, if needed.

Place the access panel door back over the opening. Secure the fasteners with the socket wrench. Restore power to the unit at the fuse box or circuit box. Conduct a test run to see if your cooling problem is now fixed. If problems are still occurring, call in air conditioning contractors for repair help.

For more information, contact Kamloops Heating & Air Conditioning or a similar company.