Wouldn't that be the case for any advice given on this forum whatsoever? If one could be liable for injuries, wouldn't there be liability for damage to components or surrounds if someone followed some questionable/unclear advice?
But the fact posts can be edited (more importantly by moderators etc..) should mean that anyone can simply argue their post was tampered with. Or the opposite that the numpty DIYer could claim that they received bad advice and someone changed the post afterwards or removed it etc.... I would like to see if there has ever been a successful case against someone on a forum for advice given which led to some problem. Also would any disclaimer on a signature be legally binding to omit liability? Could DIYNOT be liable for allowing such advice to be given?
Maybe a sensible warning but in reality I am not convinced, I also agree that it shouldn't be just singled out to the heating controls (although there is a hell of a lot of them lately). Also this site has no way to verify posters (except for CC users) so putting a claim against some anonymous person (assuming VPN, no personal info given/identifiable etc...) would be rather difficult.