This error code is visible if there is an issue with the temperature of the water. This code will show if the water or ambient air temperature drops below 4°c.

These pool heaters are not designed to operate below 4°c. We recommend you disconnect/ unplug the pool heater and place it in a warm environment to allow the internal parts to warm up. Once warm, place the heater back on the pool ensuring the water is above 6°c.