Massive fail ! …..i have searched every inch but have been unable to locate the temperature sensor despite now knowing what it looks like . am i right in thinking that to access the fans to lubricate the bearings i would have to remove the boiler completely as it is built into the back of the curved kitchen cupboard ? presumably this is a gas safe engineers job as it would be unsafe for an unqualified person such as me to do .
many thanks for your help