Covering an issue when connecting to the NFC furnace control board via App. Be sure power to the equipment is off and bulky protective phone cases are removed. iPhone NFC antenna is at the top of the phone. Android antenna is in the back/middle of the phone. Be sure that you start the process with the phone outside of the furnace then move in when prompted by the app. Another side note. You may get an error message if you are on a call and trying to do the NFC tap at the same time. Hang up your call then attempt the tap again.