"dennis@home" wrote:

Do the pipes branch off from a 22mm feed or do they run in 15mm from the
ground floor?

Haven't opened the boxing yet, but I'm pretty sure that the
upstairs/downstairs split is half way up ground floor wall (heating solenoid
valve is approx level with wall mounted boiler, believe the 22/15 split to
be there also).


Have you tried bleeding the system?

I have drained, refilled and flushed numerous times when replacing old rads.

Have you tried opening (just a bit) the lock shield valves on 6&7?

Yes


Thanks

Phil