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Its the four nuts on the outer heat exchange, using a socket set. You will have to remove one screw on the black air intake pipe to get to the nut behind. I only loosened it by a half turn. Not as previous post who must have thought that I loosened it to a degree that it was hanging on by a...

I loosened the torx screws slightly which solved this problem. Then after approx 3 months (giving time for boiler to settle down) I re-tightened the torx screws and hey presto! no more clicking noise.

HELP!!!!!!!!!!!!!!! I had my central heating system updated 3 weeks ago with a new Vaillant Ecotec Plus 831 Condensing Boiler and the system was power flushed during the installation. All the radiators have had TRV’s fitted and a new room Stat fitted. The system was treated with corrosion...