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Solar Hot water not working - pressure/valve or MTDC problem?

Hi - three days ago my solar hot water stopped heating my hot water. The MTDC (Medium Temperature Difference Controller) is still on and the circulating pumps still operates. Could there be something wrong with the pressure valve? I've attached three photos: Photo 1 shows that it was a really sunny day - the temp of the solar panels was 109 degrees while the temp of the hot water was only 27 degrees. Note also that photo 1 shows that a very unrealistic whopping 28.9kw - I only have 2 solar panels for the hot water... Photo 2 shows the pressure gauge and suggests there could be something wrong here? - I note in the days prior to this issue the MTDC recorded a very high 80 degrees for the water inside the hot water cylinder. The pump is now making a much louder noise than previously - it's pumping even now at 8:20pm when when it's cloudy. Photo 3 shows the other gauges. I still have hot water but that's thanks to the electricity rather than the solar panels...