- 1). Check the basic components of your thermostat to ensure the problem isn't as simple as a dial turned the wrong way. Make sure the thermostat is set for air-conditioning or heating as desired and that the "On" switch is in the right position.
- 2). Change the thermostat battery. A dying battery can cause a thermostat to malfunction or fail to operate at all, so check the battery in a testing device or simply replace it. Make a note of when a new battery is placed in the thermostat so you know to change it at the proper interval to keep your system adequately powered.
- 3). Perform a basic test on the thermostat, with the help of a friend, to see if it is working properly. Have one person stand next to the furnace and the other at the thermostat, turning it from the low setting to high. When the thermostat is adjusted, it should make a noise, according to Acme DIY. Within moments, the furnace should also make an audible noise as it begins to operate. If it doesn't, there is most likely a problem with the wiring that requires professional assistance.
- 4). Call a professional to inspect the unit if changing the battery and conducting a basic test fail to get the thermostat working properly. Problems with wiring or other complex components of a home heating system require the assistance of a trained professional and can be dangerous to try to fix on your own. A professional can also clean and calibrate the thermostat for optimal performance.
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