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Thanks for feedback. The heating was ok before. Nothing odd in pipework but will try shutting off rads apart from nearest. If it was heat exchanger would this not also affect the DHW which is ok?

Personally I am not convinced the pump is the issue. I am satisfied both old pump and new were fine and speed was never an issue as it was never changed until looking for a cause. Some time ago, following the hot water failing I fixed this but at about that time the CH never got hot. Did the...

Thanks for your quick reply. Interesting points. The Spindle on the temperature knob was broken by someone? I have removed the remains and yes using a small screwdriver made sure it was turning and set to max. I will replace this part once boiler up and running. I will check the valves after...

Hi folks, Basic set up no timer or external components. No issues whatsoever with hot water which got a new thermistor from me recently due to its having failed. Previous owner had boiler regularly serviced and seems otherwise in good shape. Switch on boiler at mains for heat, burner runs for...