What does the indication E-1 to E-8 on the display of my external heater mean?
As already described in the operating instructions, E stands for Error and indicates an error in the operation of the JBL PROTEMP external heater. Here you can see how each message can be easily solved.
E-1: Cause: Water temperature is at least 1 °C above the set temperature. Solution: Regulates itself when water temperature drops.
E-2: Cause: No water or air bubbles in the heater. Solution: Ensure that the heater is positioned as vertically as possible and that there is sufficient water flow.
E-3: Cause: Electronics defective. Solution: Can only be fixed by a specialist.
E-8: Cause: Temperature above 93°C. No water flow, or the inside is too soiled. Solution: Clean the inside of the heater with a hose brush (see chapter 8 Maintenance) and ensure sufficient water flow.