Hi,
I currently have a Geyserwise Max unit that was installed way back when these first came out. Last year (2021) I installed a hybrid solar system for the entire house with the geyser in non-essential section of the solar system. Since then (2021) I have been constant E4s with my geyser unit and now the water is not heating up.
Will changing the entire geyserwise unit be a permanent solution?
If this is changed, is there any extra thing that is needed to accommodate the primary solar system that runs the house power?