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Guys, thanks for the advice. Got a new actuator from Amazon, wired it in and hey presto all is well. Pity I had to fit a stat and programmer just to find out they weren't at fault but there we go. Thanks for your advice!

Appreciate your quick responses. Agile, thanks for confirming the signal to the boiler is sent via the actuator, I'm fairly certain now that is where the fault lies. Hailsham, the fault is intermittent but has occurred both when h/w is on or off at timer. It either sorts itself out after...

Hi, I'm after a bit of advice please. I have a basic hot water / central heating system that is pumped and uses a hot water cylinder. I have a 3 way diverter valve and the usual controller and stats. The problem I had was with the central heating. If the programmer was switch to on (auto...