Apologies for the slow reply, I have been hectic for the last while and seldom make it onto the Forum.
I have not previously seen that odd pulsing that you are getting on your display, but it looks like supply voltage fluctuating. How do you power this system? If it is powered via PV panel and battery then I would suggest checking the battery as this is a common failure point.
If AC powered then it is probably failure of the controller, but go through all cabling and connections 1st.
pilotfish got a reaction from Goedman in Hello Pilotfish, You seem to know a lot about GeyserWise products. I have two geysers