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Hello, My name is***** have your name please?
What type of unit are we working with, Manufacture and model please?
Give me one moment while I research the unit
So your thermostat is what is locked up?
Have you replaced the batteries?
How old are the batteries?
If you have performed a reset and the thermostat is still showing OFF and batteries are good then unfortunately it is time for a new thermostat. I would recommend Honeywell for replacement.
You did say you performed a reset correct?
Try pressing Next, Next, Next, Hold
Did you get any result from that?