y-plan new motorised valve fitted - not firing up

[moony]

as title says.....

its a floor standing ideal mexico - the 3 port mid position valve was fitted today and now the boiler isnt calling for heat - the pump runs, put me in front of a boiler or combi and im fine - but put me in front of a s-plan or y-plan wiring and i'm scratching my head - im due back there tonight - so any pointers or what to look for would be massively appreciated

now i dont know if this was an existing problem or a new one since the motorised valve has been changed - new body new head and all wires gone back to the same way as before.

[CES]

I assume you have put all the thermostats up to max? Cylinder, Room and the boiler? Check for a supply to the boiler..

[shorticus]

This is odd. If the wiring has been done according to honeywell's schematics then the pump and the boiler should both have a live from junction 8 in the terminal box, this is fed from the orange wire from the valve, i.e. if the pumps live then the boiler should be too

[shorticus]

sorry didn't mean to confuse things, what I meant was if the pump is live then there should be a signal live being sent to the boiler, I believe that the mexico also needs a permanent live

[metaldust9]

on of the engineers on here has put a wiring diagram up so look for the post and its on it

[moony]

I assume you have put all the thermostats up to max? Cylinder, Room and the boiler? Check for a supply to the boiler..

im not that bad haha - yeah done that pal

[CES]

Just a thought, what model is the mexico? There is a down draught overheat stat fitted to some of them, fitted in series with the control stat. It could be holding it off?

[CES]

im not that bad haha - yeah done that pal

I didnt mean to be cheeky btw! no offense meant!

[moony]

no worrys - sorted now was a clogged up system and i mean clogged!

[shorticus]

good to hear you sorted it, must've been quite satisfying