I have any older thermostat. It showed low battery. I replaced with 2 new AA but it continues to show low bat

Replace the tstat

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Originally Posted by mike 165278

Replace the tstat

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Most Maple Chase thermostats had a space for two batteries but only need one to operate. These were early digital thermostats which had a volatile memory. This means they would "go stupid" & loose the program if the batteries were removed. It operates on one, but before removing the old battery you put a new one in the other space thus never completely losing power.