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Have you tired turning breaker off at indoor unit and back on to see if it will reset?
Normally blank screen is an indication we are not getting power to the thermostat.Do you have a multi meter so we can do some troubleshooting?
If you do not have a meter
you can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.Otherwise about the only other thing you can do is look in air handler and see if maybe there is a small auto type fuse blown.
If you have further questions, please let me know.
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