Quick video to help you understand if your thermostat needs to have batteries to operate properly and how you can check if you have a common wire. If you have a c wire on your current system this will power the system indefinitely and you wont need to replace the batteries.
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How to change the batteries.
Will thermostat work without batteries. If the c wire is run from the thermostat to the air handler furnace package unit the thermostat will work and the c wire will save the batteries. If you do not hookup the c wire when the batteries get weak the the unit will not run. If the batteries are not changed quickly enough the time allotted can vary by model thermostat settings may be lost.
Manufacturers discourage using rechargeable batteries as many rechargeable batteries use improper voltage. If it loses power from the wire it will think there is always a power outage. When a thermostat doesnt have good batteries in it the readings can be inaccurate especially in battery operated units.
The inaccuracies will have a negative effect on the temperature and time settings resulting in inefficient energy use. This will result in the thermostat needing to be reprogrammed. The thermostat will not operate the heating or cooling system until new batteries are installed.
After the batteries are completely dead the bat lo indicator will disappear leaving a completely blank display. Honeywell thermostat display lcd went outno batteries. If you have a unit that uses battery power remove the front plate from the wall plate and change the batteries to see if this brings the thermostat back to life again.
It will take 5 wire thermostat wire to run the furnace and ac and 6 wires plus for a heat pump. Related questions more answers below. The batteries in the thermostat are really only there in case of a power outage as a courtesy to remember all of your programs.
Many are wired into the electrical system of the house. This would defeat the primary purpose of a digitalprogrammable thermostat. Not all thermostats use batteries.
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