One of my Radiator Valves HR92 developed a high pitch squeak and on examining it, I noticed that the digital display all of the icons were being displayed at the same time. So, on first thought I thought this might be low batteries, and I replaced them for new ones, but the problem persists. Lucky enough I have a spare valve, and I did a swap.

However, my question is really to ask whether this valve could be fixed, and if so, what are the steps I need to perform to fix it?

Has anyone been in this position and know what to do?