I had this problem with my modena 102. I changed the hot water sensor in the boiler.When you buy this sensor you buy as a pair(cold water sensor aswell) so change the both at the same time.Hope i have been of help.
Darren Edwards
April 2007
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.