The answer to 'condenser not heating' is that the most common causes are a failed compressor, refrigerant leak, or electrical issue. Symptoms may include the condenser fan running but the unit not heating, or the compressor not turning on at all. Solutions can range from simple DIY fixes like checking the circuit breaker or refrigerant levels, to more complex repairs that require a professional HVAC technician.
If the condenser is not heating, it's best to first check the basics like the power supply, thermostat, and air filters. If those checks don't resolve the issue, it's likely an internal component failure that will need professional diagnosis and repair.