The answer to 'my replacement keeps shutting off' is that there are several common causes, including a malfunctioning thermostat, a clogged air filter, or issues with the compressor or refrigerant levels. The symptoms may include the unit cycling on and off frequently, inconsistent temperatures, or the system not running at all.
Some potential solutions include checking and replacing the air filter, calibrating or replacing the thermostat, or having a professional inspect the refrigerant levels and compressor. In many cases, the issue may require the expertise of a licensed HVAC technician to properly diagnose and repair the problem.