wrote:

Way back in 2011, Mark Carver wrote:

A friend is puzzled by a symbol on his new boiler's control panel.
It shows a Top Hat and Ladder ? !
http://www.markyboy.net/Top-hat+ladder.jpg

What the absolute HELL is this top hat and ladder?

Maybe it's a German boiler and it refers to sending a chimney sweep up
onto the roof? maybe you press those two buttons together to disable the
boiler during flue cleaning?

https://www.google.co.uk/search?tbm=isch&q=german+chimney+sweep