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Ok thankyou Geoff1946 and ProDave.  Food for thought, and I will be checking out the components and functionality. As big Arnie said.....I'll be back!

Yes Sharpend, I've now turned the tank thermostat down from 65C to 60C (my understanding is this is minimum temperature to kill Legionnaires bug etc) and it made no difference as I expected.  The boiler stat is full on as I believe it is supposed to be.  I can override the hot water system...

OK ProDave.  I will try just reducing the cylinder thermostat setting to see if that has any effect. Thanks for the input.

Hello, looking for helpful advice please. I have a conventional fully pumped central heating system with a 3-way zone control valve.  When run on the radiator system, after end of program the radiators dissipate the system heat and the overrun cuts out the boiler as it should.  When run on the...