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I filled it to 1.5bar.Just before the burner cut off it went upto 2, now back at 1.5. A nominal amount of air came out (screw was only just finger tight?) then tiny amount of black water, then clear and nipped it tight. How do i vent the heat exchanged?

bled the pump. turned boiler back on, on the display got a 5 then 0 then d (for hotwater)and burner came on for aprox 20 seconds, then went off and l9 with constant motor(def the fan blowing up the flu). turned off at wall for 30 secs, back on, still l9. used reset button, back to 3 lines and...

boiler is constantly runing, sounds like the fan?? Can I vent myself(non gas safe) or do i require the front sealed panel off?

Hot water suddenly gone off with the above boiler (14 months old). Gone through the fault finding and discovered the boiler pressure was 0, even though no fault code was been shown (the boiler would fire for a few seconds then cut off). Refilled the system and restarted, this is when l9 showed...