Hi I have good news I’m back on … I tried the advice onecal gave us ie reconnect unit after checking power available to unit ,at this point unit still dead ….. hold power on button together with program button unit comes back to life ,didn’t get as far as holding twilight button. Unit now showing all functions and the connection for the gas is operative . This was a positive result and I am very grateful to you all for your input hopefully this thread sits here and can help others with unnecessary expense. Lawrence .