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Overheat thermostat?

Why does the overheat thermostat often trip? Would could be the problem? Could anyone suggest ways of solving the problem?
Pravs, February 2007
Scaled-up DHW heat exchanger. Take it off and soak in proprietary kitchen limescale dissolver.
That worked for me.

Vinnie, March 2007
Potterton profile 60e

Pravs, February 2007
on what?

mr gas, February 2007