Thanks Chris, but where is the air vent?.
I've also noticed that a few minutes after the reset button pops up, the boiler makes a horrible gurgling noise. Adding to your idea of there being air inside.
I switched off my Worcester 280 RSF and drained the radiators, then replaced the bathroom radiator. I then refilled the radiators and bled them. When I followed the operating instructions for relighting the boiler, the results weren't quite as I expected.
The instructions say to turn the...