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Cheers Tony. I am sure there are no fail lights. If the boiler is left long enough after drawing hot water all the lights will go out and this is with the slector requesting CH (in the CH / HW mode)

No flashing warning lights. After using hot water, temperature lights remain constantly on to indicate temperature (steady) Post hot water turn off, burner stops immediately, flue fan continues for approx 10 secs. Power on light on all the time. DHW light on whilst drawing; burner light...

Yes, there is power at the link, boiler not old

Hot water works fine. The central heating does not respond at all. Original link in across the CH demand terminals - no external controls. Any ideas!? Thanks in advance.

No - its her own house. The reason I do not suspect AAV is that with the CH off the pressure falls a little. Therefore should see water coming from it. I have been reading what is on forum - a mine of info. Next stop is to look further into pressure vessel. Never though of that! When it...

Gents, My first post! Girlfriend just moved into this house with the above boiler. All the radiators bled as they were all hot at bottom only (loads of air out!). Pressure put at 2bar. Thing is after 12 hours or so the system pressure falls off by 0.5 bar. Tried leaving it with no...