Why does my Hayward pool heater keep shutting off?
Why does my Hayward pool heater keep shutting off? Overheating Pump The modern-day pool heaters are designed to shut off when pool heater running but not heating, causing overheating to the pump. This is the duty of the thermal overload switches. So if your heater keeps shutting off, you may need to look at your thermal overload switches and change the faulty ones.