Hi Guys,

We've had a geyser wise installed as part of the solar geyser installation. Recently it started giving me E4 errors.

According to the manual this means that there is heatloss somewhere. Because there is too big a discrepancy between the energy going into the geyser vs the rise in water temperature.

I doubt this is the case as new pressure release valve ejects steaming hot water onto the roof with the temperature ready barely touching 50 on the display. This only happens on when the electric element is on.

On sunny days the display goes up to 90+ without the pressure release activating.

What could the problem be?

Broken thermocouple?
Faulty controller?

What is your experience with this issue?

Regards
Theo