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Hi I amCustomer this is a common problem with touch screens t-stat.
From my understanding and experience the touch screens are nice but not real durable when it comes to being used alot. They are great for homeowners who don't operate it that much, but set and forget. Repetitive usage such as a commercial office space just wont last like a traditional one will. I have read of problems when a touch screen is used (touched a lot) and it eventually will fail to take the inputs after high usage. Just make sure it,s not in lock mode, refer page 16 of this manual.
Replace T-stat, 5 year warranty on that model