bruce_ miranda, done the 5c as suggested and all zones are now showing 0% and no green LED lit. I will see if its the same tomorrrow, i will keep the champagne on ice till then.
DBMandrake, is that the set point when heat is called for, ie living room set at 21.5c. All zones HR92,s. I will check the fitting of the HR92,s as i am having problems with one. No other temp sensor other than HR92,s.