Solar power diverter (not working) (Sherfield on Loddon, RG27 0)

Solic 200 diverter, designed to divert excess solar power to an immersion heater rather than export it. This one was in use for a few years, we found it very effective, but then it failed so I installed a replacement. I believe this one could be repaired by someone with the necessary skills and equipment. NB there is no current clamp with it.