The answer to 'condenser not working' is that there are several common causes, including a malfunctioning compressor, a refrigerant leak, a problem with the electrical connections, or a failed fan motor. Symptoms may include the unit not turning on at all, the fan not running, or the compressor not kicking in.
Some potential DIY solutions include checking the circuit breaker, inspecting the condenser fan, and looking for obvious refrigerant leaks. However, most condenser issues require professional diagnosis and repair by a licensed HVAC technician, especially if the problem involves the compressor or refrigerant system.