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Doesn't look like we have one - in the wiring diagram there is nothing below the overheat stat. I have "high limit stat" to the right and thermostat to the left, but nothing below.

Thanks for the reply. Would that be the same as the "over heat thermostat"? (I can't find reference to an overrun in the manual)

A bit more info to add to my problem. Earlier in the year, the heating would continue to run even when we'd switched the heating part of the programmer (Danfoss CP15) to "off" and turned the thermostat in the lounge down as far as it could go. If the hot water would come on, so would the...

Thanks for reply. Can you advise how I can test? Already paid for plumber to come round who didn't diagnose issue so I'm loathe to fork out again. Thx

Just had a friend look at it and he tells me it is actually the circulator pump that won't shut off - not the boiler. He suggests changing the Danfoss valves in case the microswitches have blown. Does anyone know if that sounds feasible? Thanks !

~just edited my post title to be more accurate~ Hi All I've read through the various posts but am still stuck s hoping someone might be able to help. We have an old Maxol Microturbo 40H boiler (c. 18 years old) and a Megaflo hot water tank. We've only been in the flat six months and...