Sabre 24 HE boiler was lighting then switching off and flashing red light,when I checked it I could hear fan coming on and clicking to light gas,I've cleaned tubes on pressure switch which worked for a few weeks,but problems returned,double checked tubes seem to be clear and can hear pressure switch clicking,but I noticed boiler works and sucks in a lot of air when I have the front cover off (not boiler cover,but main boiler cover to exchanger)as soon as I clip it on the flame slowly dies away,I've checked flue pipe and inside and outside pipes are correctly fitted so gasses not mixing,has anyone any ideas.
I think it's a coincidence but problem started right after gas safety check was done.
I think it's a coincidence but problem started right after gas safety check was done.