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Ok, pictures of the system can be viewed here: http://dnunez.bulldoghome.com/photos/BDRES/dnunez_bulldoghome_com/ The 1st & 2nd pic is of the boiler and boiler control. The 3rd is of the motorised valve next to boiler, the 4th is of what I believe to be a motorised valve attached to a pipe...

Hi all, I have a open vented central heating system with an indirect cyclinder and a concord wrs 255A boiler. Currently the DHW is boiling hot. I recently replaced the thermostat on the cyclinder as the temperature dial on the old one broke off. It appears to have made no difference. I have...