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fore
Feb 17, 2013, 10:10 PM
I have a maple chase thermostat about 20 years old. The batteries (AA) used to last about 2 years. Now only a couple months - what's wrong?

hvac1000
Feb 18, 2013, 12:49 AM
It is possible that the common wire that powers the display has been lost/disconnected somehow which would force the thermostat to operate on battery only. This could be the cause of your battery's not lasting so long. There are other possibility's but a service person would have to be On Site to test further.