The answer to 'my evaporator coil keeps shutting off' is that there could be several common causes, including a refrigerant leak, a problem with the thermostat or control board, or a blocked airflow issue. When the evaporator coil shuts off repeatedly, it's usually a sign of an underlying problem that needs to be addressed.
Some common symptoms include the coil freezing up, poor cooling performance, and the compressor cycling on and off. Potential solutions may involve repairing a refrigerant leak, cleaning the coil, replacing a faulty thermostat, or addressing an airflow blockage. However, diagnosing and repairing HVAC issues often requires the expertise of a professional technician, so it's generally best to call for service if the problem persists.