1. Turn OFF your AC unit
First, switch your thermostat to the OFF position and turn your fan to ON.
Next locate the Breaker for the outside unit and turn it off.
2.Check your filter
A dirty filter could be the cause of this AC not cooling issue. Your air filter might be inside the air handler unit or in a filter back grille .Locate your return vent, unscrew the cover and check your filter. If it’s dirty, simply replace it. It’s easy and new air filters can be found at almost any home improvement store.
2. Let your AC unit Thaw out
After the power is off to the AC unit .Give your AC unit a few hours to fully defrost.
The second step is to locate your air handler and the frozen coil. Due to possible water leaking from the melting ice we recommend placing some towels or a bucket under the air handler to prevent water damage.
3. Start It up
After allowing a few hours for the AC to defrost, switch your thermostat back to COOL position and turn on your outside breaker . If the air comes out cooler than room temperature, your AC is up and running again.
It’s always smart, however, to call a local AC company, let them know what happened and have someone come out to inspect your unit to prevent this from happening again.