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I changed the batteries in the thermostat and reattached to the the back plate. Now the touch screen does not responded (including the system button). Is there anyway to fix this?
 

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Did you insert them with the proper polarity?

+ to + and - to -.

No joke. I had a customer put them in backwards and fried the thermostat.

Are they brand new batteries?
 

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Did you by any chance feel a static shock when handling the stat.

Any decently designed battery operated electronic device should have a diode or something to stop it from getting cooked due to reversed polarity.
 

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see if it still has warranty.
 
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