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Thanks, both, for the advice thus far. 45yearsagasman: Such as an intermittently sticking valve, or something similar? I had to do the power-off/power-on routine for the programmer again last night, but as previously it did the trick. So it's beginning to look as though whatever the cause...

Hi all, I recently moved house and have inherited a central heating system of mixed age. The boiler (Worcester-Bosch Greenstar) is quite new - the original 10-year-old Suprima having apparently given up the ghost - but the controls are still as they were for the Suprima. There's a Potterton...