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Sime super 90 hot water problem?

I have a Sime super 90 and the over temp is tripping when there is hot water demand. I replaced the diverter valve e about 3 years ago, it seems to be working as withe gas turned off the diverter valve switch is clicking when you turn on the hot tap
Mike, March 2013
Two thing does that sensor is at faulty or hot water heat exchanger is blocked

ltd, March 2013
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