VIDEO: Can anyone identify this boiler behaviour?

[alias51]

I recently removed a radiator and capped off the pipework. When I refilled the system, the combiboiler (Promax) seems to have air in it and makes a "clunking" noise when supplying hot water.

VIDEO HERE:

Both hot water and central heating work fine, although the hot feed no longer consistently supplies hot water (it fluctuates a little when in the shower).

I have bled all the radiators, although not sure how successfully!

Any ideas what could cause this / what the remedy might be?

 

[gigz]

Its either air or the pumps siezed (i'd say pump). Take cover off and bleed the pump (take big screw out of centre of pump, use a terminal driver to check pumps spinning).

 

[alias51]

Thanks @gigz - do you mean drain the heat exchanger?

 

[Stadan20]

Wrong boiler diagram

 

[gigz]

Number 4 on the pic

 

[alias51]

Thanks @gigz can you post the link to this manual? I can't find it from searching.

 

[Stadan20]

http://www.baxi.co.uk/documents/7219665-01_Duotec_HE_A_ErP_Install.pdf It's the same

 

[Cgas]

http://www.potterton.co.uk/downloads/Promax_Combi_installation_and_servicing_manual.pdf