Unable to pair Honeywell TH8320ZW1000 with Vera3

Dear forum,

My Honeywell TH8320ZW1000 arrived and the installation was smooth. However, I have not been able to pair the thermostat with my Vera3. I have entered the RF10 option and it currently shows 1 (include) but I am unable to change it to a 0 to exclude in case it was previously added to another system prior to mine. I have used the low power pair within 3 inches and also the high power inlcude without success. Any ideas?