In an earlier contribution to this discussion,
Set Square wrote:


The wiring would need to be as per the Y-plan diagram in
http://content.honeywell.com/uk/homes/systems.htm but with 4 and 5
bridged in the junction box. Note that the cylinder stat needs to be
of the changeover type which provides a "HW satisfied" signal to the
3-port valve - otherwise everything stops when the cylinder stat
switches off. This could be your problem!


Did you manage to get it sorted, Hugo?
--
Cheers,
Set Square
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