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Even fully closed hot water is coming up the return pipe when HW only is selected so I'm guessing the valve is faulty. Cheers Biffa

Thanks. It's got an automatic bypass valve with a dial held by a screw. Can this be turned off in the same way?

Yes. The return pipe does warm up. It doesn't get as hot as the flow pipe but it does warm up pretty nicely. What does this mean? Thanks Biffa

Thanks. Tried that, a little air came out but not much. But problem still persists: boiler calls for hot water, motorised valve opens, boiler fires up, hot water can be felt in pipes both side of valve (2 port). 30 seconds to a minute later, boiler powers down, valve closes. Something's...

Hi I've got an Ideal Icos condenser boiler. When it calls for HW only, it fires up OK, runs for about a minute, then shuts off. I've changed the cylinder thermostat, but that hasn't worked. The CH is working fine. Any ideas what's going on. It's as if the boiler believes that the cylinder...