This Old House released “How to Repair a Frozen Air Conditioner,“ in which Richard diagnoses and performs a home air conditioning repair. The homeowner indicates that his air conditioner runs for only an hour before stopping, and ice forms on some internal parts.
For Richard, that indicates a lack of airflow through the unit. He first checks the return air filter before troubleshooting the air conditioning coil and finding it frozen.
Next, Richard takes some measurements and determines the home needs a 3-ton air conditioner but has a 4-ton unit installed. He mentions that oversized units often result in the symptoms the homeowner describes. Unfortunately, replacing the unit is the only way to fix the problem.
The rest of the video covers draining the coolant from the old unit and replacing the outside condenser unit and the inside evaporator coil with 3-ton versions. That involved swapping the condenser and evaporator coils and fitting them to the ductwork, the copper tubing for the coolant, and the electrical systems.
Once in place, the team performs checks to ensure the system works correctly and efficiently. Since the air conditioner turns on perfectly, they have completed their home air conditioning repair and you can rest assured it will work for years to come.