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OK. The indicator on the side behaves as expected. I still have my suspicions though that when CH only is on, some hot water is making its way to the HW circuit. I say this because the pipe to the cylinder becomes warm after a while - not hot, just warm.

So what you're saying is it's normal for the manual lever to go all the way to right i.e. the midpoint position, not just when you manually move it there. You may be correct about the wiring - I haven't been able to verify that. What's still confusing me is that when I'm on heating only, the...

Any suggestion why it would be opening both ports? Or is the obvious answer that the valve is buggered? Is it possible to take the lid off these valves and have a fiddle?

Ah, OK. Thanks for that. So does it make sense that the lever goes all the way to the right, which opens both ports, when only CH is on?

Not sure how old the valve is - we haven't owned the house from new. Pipe from bottom of HW cylinder is slightly warm. I understand your comments, but I'm more baffled by the movement of the lever to the open position. Is this normal?

I hope someone can explain to me what's going on with my 3 port valve and whether it's normal. It's an ACL Lifestyle midpoint. I have a programmer that allows separate CH and DHW. When I force it to DHW only, everything's fine in that the WMH indicator on the valve goes to W and the manual...

My boiler has just developed a fault whereby it mostly won't fire. By persisting I can get it to fire maybe one time in ten but even then it shuts down after about 10-15 secs. Any suggestions what might be wrong?