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im down from merseyside next week working on a property in foxton near market harborough.ill stay an extra day and fit you a vaillant etc for about 2000 quid.my mate works as a breakdown engineer in leicester as well, he will quote you if you want.

dont think they do an external aav.a durgo valve can freeze .get a 4inch chimney china mans hat type cowl.

open your thermostatic rad valves to fully open and see what happens .

you need an engineer to look at it. could be aps, fan , venturi .

mrcentralheating are selling duo tec 40kw at less than 900 delivered

where do u live. one of the guys on here maybe able to quote.

min gas pressure is the first thing id check.

has any trvs been turned down since having room stat fitted.

300mm from any break in the fabric. unopenable window is still a break in the fabric.

yep

domi 24b goes to spark but no gas .theres 240 at the valve and boiler is only about a month old. anyone had problem with gas valves on these.

diaphram.

my experience is the white connector plug (5 PIN) i think, bends and causes loose connection.leave the panel down and see if it runs o.k

do you get sparking

does the fan run

check the connection on the pcb as you drop down the control panel. it sometimes works loose as its pushed slightly sideways by the overheat stat.

easy fix. went out to it today and turned it on and it worked. :o :D

blocked plate heat exchanger or min gas pressure too high.could also be faulty thermister

remove pump.

when you say spare, do you mean spare incase the pcb fuse blows. if so , dont think they supply a spare for that boiler.