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The batteries are for backup when the thermostat is connected to 24-VAC power. It has a LED screen and push-button controls, and it’s suitable for conventional heating/cooling systems and heat pumps. What do the batteries do in a Honeywell thermostat? If, after changing the batteries, both the thermostat and your heating and cooling systems begin to work, then job well done. When low batteries eventually die, you’ll see a black display screen, the thermostat will stop working and your heating or cooling units won’t function. What happens if your thermostat battery dies? A car’s heater core is like a second radiator. The heater, however, is a different story. Other than that, the AC system could care less what the engine is doing. Under most circumstances, a bad thermostat will not have any effect whatsoever on the air conditioning system.
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How do I know if my thermostat is broken? Can a low battery affect air conditioning?Ī weak car battery can cause your auto air conditioner to function poorly or not at all. Look for and address simple reasons why the thermostat isn’t getting power, such as dead batteries or a tripped breaker or blown fuse in your main electrical service panel.
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If it is not, the thermostat cannot signal the air conditioner to cycle on. If your thermostat doesn’t have a C-wire, it probably needs batteries. A number of models do, though, and if you need to change your Honeywell thermostat battery, you need to know the model. Honeywell sells a variety of thermostats, and not all require batteries. Does the Honeywell thermostat use batteries? Other thermostat malfunctions could also be the result of bad batteries. If the screen is blank or unlighted, a battery change could solve the problem. Check the batteries: Many modern thermostats rely on battery power to operate.