In my furnace, if the safety decides to disconnect it stops juice to the
thermostat which then runs down the back up battery and end up with drained
battery. Usually happens if condensation pump sticks and overflow tells
furnace to turn off. If you have a condensation pump check the sump to see
if it is full. Otherwise you may have a more significant furnace problem.
Condensation pump floats often stick due to algae and sump needs to be
cleaned once in a while.



"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.

Thanks, people.