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did you hold the lock icon for a full 5 seconds?
does the lock show open or closed?
i really wish there was a more technical answer. But in this economy series there are few options and not a great lifespan.
If the lock does not open with a 5 second hold then the lock is defective rendering the thermostat unusable.
The good news is this thermostat runs only $25-$30.
I apologize but there is no remedy if the 5 second hold fails
you are welcome and I wish you the best