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Same thing happened to us. Called manufacturer and suggested to reset the thermostat as follows:
1. Turn OFF thermostat
2. Press MODE and ZONE buttons at the same time
3. Wait for display message "Init"123
4. Release buttons then press ON/OFF button
5. Proceed to turn on furnace
If this does not help, call your A/C manufacturer and ask for instructions to reset your thermostat. We have a DRV Mobile Suites.
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