Hi
I have just had the same problem and after much searching I found the following on the web - and it worked.
I replaced dead batteries and then followed the setup instructions from the beginning - as if it was being newly installed. ie turned off the electricity supply.
http://www.invensyscontrolseurope.com/NR/rdonlyres/36F285D6-CFEA-4D3F-85ED-39A2E9ED610A/7546/090793_A.pdf
Copy anfd paste and good luck
Margaret
Margaret
September 2008