The answer to 'condenser not heating' is that the most common causes are a faulty compressor, a refrigerant leak, or a problem with the condenser fan. Symptoms may include the condenser not turning on, the compressor not running, or the condenser fan not spinning. Solutions can include repairing or replacing the compressor, fixing any refrigerant leaks, or troubleshooting and replacing the condenser fan motor.
In many cases, troubleshooting and repairing a non-heating condenser requires professional HVAC expertise. DIY homeowners may be able to check basic electrical connections and the condenser fan, but should call a licensed HVAC technician for any issues with the compressor or refrigerant system to ensure the work is done safely and properly.