How to Troubleshoot a Rheem Four Ton AC Unit

Set the Rheem system power switch to “Off,” if the unit fails to cool. Adjust the thermostat or confirm that it’s set to the desired temperature. Allow five minutes to pass and move the system switch to the “Cool” setting.

Locate the high-pressure switch reset button on the outside unit, if your Rheem comes with one and the unit isn’t cooling. It might have been tripped due to a power surge. Press the button to reset the unit and allow a few minutes to pass before restarting.

Locate the circuit breaker box that houses the circuit breaker for the Rheem, if the unit doesn’t receive power. Open the box and inspect the state of the air conditioner circuit breaker. If the circuit breaker switch is in the “Off” or middle position, the breaker has been tripped and electricity is unable to flow to the unit. Flip the circuit breaker switch to the “On” position.

Open the filter vent inside of the home, if cooling efficiency is low. Remove the air filter from inside of the air filter chamber. If the filter is dirty, either replace or clean it. Run warm water over both sides of the air filter, until all the dirt is gone. Allow the filter to dry and reinsert it into the chamber according the directional indicators on the filter. Close the filter vent.

Inspect all outlet vents in the home for blockage, if the unit fails to cool certain rooms effectively. The vents might be obstructed by furniture or drapes. Clear all obstructions from the front of the vents.

Inspect all outlet vents to confirm that they are open, if certain rooms aren’t cooled. Pull the levers of the vents open.

Search the home for leaks, such as open doors or floor vents, if the unit fails to cool the home. Cold air might be leaking out of the home through small openings.