For anyone who's not already aware of it, the VP1/VP2 T/H sensor is
covered as a topic (which also links to some relevant related topics)
on our VP knowledgebase, which you can access at:

http://vp-kb.wikispaces.com/Sensor+Errors2

NB Not all of the KB is publicly viewable without registration -
please see the Full Wiki Access topic - but the T/H topic itself is
unrestricted.

John Dann
www.weatherstations.co.uk