Celsia 24LE / Worcester 24cdi boiler problem - Lost CH &

[PatriceDIY]

Hi ,
I have a Celsia 24LE / Worcester 24LE RSF combi boiler. It was working fine until I temporarily removed a radiator in the hallway to paint the wall.
I lost the HW when I removed the radiator, which I guessed to be normal.

Since then, I've remounted it. I used the white plastic key and the grey knob on the boiler to refill the water loop. I also bled the radiator of air and the pressure gauge is now just above 1bar (it had dropped to 0).
Unfortunately I've still not got any CH or HW.
When I turn on the HW tap, the boiler starts making some sort of rattling and sucking noise and the pressure goes up to ~2bar. The burner comes on for a few seconds before switching off. However the noise stays on for a wee while after I turn off the HW tap.

Could anyone help?
I'd really like to be able to fix it myself and not call a plumber if I can help it.

Best,
Pat.

 

[stumpydick]

i think this boiler is a 24cdi, which have an auto air vent. The top of the aav is at the highest point on the left top of casing. Check the small cap is loose and allowing trapped air to escape. However, if the aav is not working, raise the pressure to 2 bar and run bioler on ch to try and clear the air

 

[PatriceDIY]

Thank you so much.
That sorted it! I took the small cap off completely to let the air off and screwed it back on loosely. The water is boiling hot again.
Thanks again for you help!!!