How do you start a hayward pool heater?

To start a Hayward pool heater, first ensure that the gas supply is turned on and the heater's power is connected. Set the thermostat to the desired temperature. Open the heater’s control panel and press the "On" button or switch to start the ignition process, which may take a few moments. Once the heater ignites, monitor the display for any error codes and adjust settings as needed.