It can be scary and very uncomfortable when your AC unit decides to quit working in the middle of summer. It can be confusing as well, especially when the unit seems to have power but simply won't run. You're probably worrying that your unit will need expensive repairs, but sometimes the solution is a very simple one.
Here are four reasons why your AC may be unable to regulate the temperature in your home.
1. The thermostat wiring has gone bad
If you've checked the thermostat's battery and it's still good, and the display seems to be working, that doesn't necessarily mean that the thermostat is able to communicate with the unit itself. If the wires between the unit and the thermostat are compromised for some reason, you could have a fully functional unit that still doesn't turn on.
2. The temperature sensor is dead
If the thermostat is able to communicate with the AC unit, it still needs to send the right signals for everything to work out correctly and keep your home cool. If the thermostat can't tell how warm it is in the room, though, it can't correctly decide whether or not the unit needs to be turned on. So sometimes all you need to do is have the temperature sensing bulb replaced before your system will be functional once more.
3. The start capacitor is malfunctioning
Capacitors come in two flavors: start capacitors and run capacitors. AC units may have these in several different places, such as attached to the compressor or attached to the fan motor. A start capacitor gives the motor in question the amount of energy it needs to start up. So if that start capacitor isn't working right anymore, the compressor or fan motor can't begin its work when the thermostat says it should.
4. The contact has worn out
A contact helps the parts inside your AC unit get the right amount of electricity. If the part isn't functioning, it may no longer be allowing the electricity to get through and reach the various AC parts. This means that even when the AC unit has a functioning circuit, and the unit fuse isn't blown, it may still not be getting any power so it can't follow the instructions of the thermostat.
These are four possible reasons why your AC unit wouldn't turn on when your room rises over the temperature set on your thermostat. Keep in mind that there are other possible causes for AC failure, such as loss of power, freezing up, and physical blockages. For more information, contact a company like H.R. Stewart Inc.