The answer to 'evaporator coil not turning on' is that there are several common causes, including a faulty thermostat, a problem with the air handler, or issues with the electrical system. Symptoms may include warm air coming from the vents, high energy bills, and the air conditioner not cooling properly. Solutions can range from simple DIY troubleshooting to more complex repairs that require a professional HVAC technician.
If the evaporator coil is not turning on, the first step is to check the thermostat and ensure it is set to 'cool' and the temperature is set lower than the current room temperature. You can also try resetting the circuit breaker or checking for any blown fuses. If those basic troubleshooting steps don't resolve the issue, it's likely a more complex problem with the air handler or refrigerant system that requires professional diagnosis and repair.