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I would be glad to help you with that. Do you know if your thermostat takes batteries?
If you still need assistance with this, please provide model number on thermostat and unit that the thermostat controls so I can provide accurate guidance for the equipment you have.
Do not see a thermostat with that model.If front cover comes off look for a label inside.
Looking for a number like SYSTXBBUID01 or TSTATBBNHP01 or similar