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Afternoon Pete, Apologies for delay in responding to your suggestion and just to confirm that you were correct it was the zone valve on the central heating pipework and the boiler is now running like new. Cheers.

Hi Pete, yes there are 2no like the one shown top left of your three photos. There is one fitted to the pipework coming from the pump and another on the pipework from / to the large hot water storage tank and both are set in the 'auto' position.

Hi Pete, thanks for the reply. It is a sealed system and apart from one wall mounted thermostat in the hall that is it. I replaced the printed circuit board about 12 months ago due to the solenoid / gas valve not opening and it has been fine until now.

I have an intermittent problem with the boiler firing up and after replacing the wall mounted control panel it still persists. I have checked the main electrical feed from the control panel to the boiler and when the control panel is on and lit up there is no power going via the main cable to...