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Still have to move stat further up the cylinder to see if that helps. At the moment the water is still pretty hot with the stat set at 30c lower down the cylinder but hoping moving the stat higher may fix the problem. I read somewhere that the boiler has a stat, which after a period of times...

There is an immersion heater but I checked and it is switched off, so that is not heating the water. The contact area may be worth looking into, as although the area is clean for good contact, the position is quite low on the cylinder and I may try moving it up to say almost half way, to see if...

If you turn the new stat to past 30c, it clicks and the pump, motorised valve and boiler start up and as you turn it down past 30c they stop, however, the water is still pretty hot, despite it being turned down overnight and the boiler and pump still kick in as it needs to draw more hot water it...

The boiler has not fired up in hours and the pump has stopped running with the stting on the stat at 30c. The water at the taps is still very hot but assume that is just what is in system before turning down. Will monitor for 24 hours and see what happens as hot water becomes exhausted. Thanks...

I have a very old central heating system that seems to work very well but the tap water has been getting very hot of late and it appeared to be the old Honeywell L641A1005 strap on cylinder thermostat that was not switching off once the set temp was reached. I have just purchased a...