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Mira essentials 9.5 temp goes from scalding hot to cold?

I have a Mira essentials 9.5 is about 3 years old with no issued prior.

Started last week it seems to have no control over the temprature. It goes from hot to cold no matter if you turn the temp control knob. Can you help with identifiying the problem?
Giorgio, January 2011
I checked the filters and water flow which seemed fine but after alot of searching on the net etc I have managed to fix it and the problem was there is a small little ball on the bottom of the heater tank unit that pushes out as a safety mechanism. I pushed it back into the tank and it was working fine.

Giorgio, February 2011
its cycling on the tco due to a restricted water flow.

either the filters blocked or the showerhead or a mains water stopcock is not fully open.

hi-spec plumbing & heating (essex), January 2011
link Click here to see other fixes for Mira.