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RE adding X400, found JohnD's post in this thread useful:- http://www.diynot.com/forums/viewtopic.php?t=264272 Will pick some up this week. Fingers crossed it works!

Hi Tony, thanks for chipping in, appreciate it. I can definitely hear the pump going with HW only mode. See earlier in the thread, the boiler will not stay on when in HW only mode, it cuts out in <1min, if it comes on at all. Even with the stat on full / taken away from the cylinder. No problem...

Hi guys, sorry for the delay, work has a habit of getting in the way of house problems! My concern with X800 would be that it would expose weak points in my aging system, and I may end up springing leaks. Is this a possibility? Fearing that it is clogged, it sounds like the best/cheapest...

Yes, was a bit puzzled about that bazdaman, just checked out the cylinder and it is just like the indirect one you pointed out in your link. Port B goes to top of coil, return is at bottom. Can we definitely rule out air lock (because of water coming out of bleed valve)? Can air be shifted...

Thought as much, hadn't heard of removing a coil! It's pretty snug in there, might have a job without removing the cylinder. See photo. Is it also possible to perform the same procedure at the top of the coil (return to boiler)? If I end up needing a new cylinder, will I also need a new...

Hi gigz, I'll take a better photo, two mins. Is getting the coil out a relatively easy task? I thought they were sort of part of the cylinder. No worries about the mixup Hugh, I have at least learnt something (B is for Bath, love it) :)

Phew, cheers Gigz and Bazdaman, at least that's correct. So, where were we, as Hugh diagnosed, looks like airlock in the cylinder/blocked cylinder sound the most plausible. Any suggestions to remove the airlock and/or blockage? I recall hearing that you can get fluids to flush through, but...

Just for my own sanity, checked the wiring to both the tank stat and the 3 way valve, and it looks good (ref Y-plan system). Honeywell tank stat L641A, Honeywell 3 way diverter valve, both wired to standard 10 terminal junction box. Tank stat to terminal box as follows (C to 6, 1 to 8, 2 to 7)...

Cheers Hugh. So, after leaving the valve in manual for 20 minutes or so... no hot water at all. I switched the valve back to auto, heard the valve move, and the boiler cut out shortly thereafter (as you predicted). Airlock / blockage in the cylinder is looking like a strong possibility, other...

Bump. Just another thought, I have made sure there is no hot water in the cylinder (from the immersion). I have now set the 3 way valve to manual (open) and switched on the HW only. My thinking is that the rads should heat up, but, if the valve is where the problem is then I should not get any...

Thanks for the swift replies guys, all really useful. @RickMoore, the valve moves into the "Auto" position. Shall I take the shielding off to see the valve in action? The problem is, the boiler cuts off after a minute or so when in HW only mode (if it comes on at all). Should I put CH and HW...

Hi all, I have a problem with my DHW system which is not as old as the house, but it seems to behave that way! I'm looking for some advice on a problem I have with HW; ideally I'd like to know what's wrong with it, what needs replacing/repairing and how much it is likely to cost (parts and...