could be anything......
overactive preheat......
frost stat kicking in......
something else............
depends what model ferroli boiler we are talking about
and whether it displays any particular set of lights or codes on the display that are different to the normal lights display for heating or DHW
more information please
manwithnoname
May 2012
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.