"sofireme" wrote in message
news:4ceb66f7074c97aa8ee723e2d223ac2e@homerepairli ve.com...
I tried replacing the batteries twice. The first time the thermostat worked
fine for a couple hours but after that it shuts off and says 'lo bat'. I
referred to the users manual and got nothing.

Are you using the right cells (batteries). Rechargeables often develop less
voltage. If so, the thermostat is defective.