If your central air conditioner has stopped working you should know that many of the most common problems can actually be resolved on a DIY basis. While there is no guarantee that taking the time to work your way through the troubleshooting steps below will prevent the need for a professional repairman, choosing to complete this task will at least help you to narrow down the cause of your problems. Even if you are not able to fix the problem on your own, you will still be saving money by eliminating some of the steps that a professional repairman would otherwise need to complete.
Check The Power
The very first thing that you should do when your air conditioner stops working is to ensure it is getting an adequate power supply. While this may sound incredibly obvious, you may be surprised to learn just how many times a year professional repairman are called out to simply end up flipping a circuit breaker.
Begin by locating your main fuse box. On the inside of the panel door, you should see labels telling you what breakers correspond to the different areas of your home. Locate the breaker that controls your air conditioning system and ensure it is in the "on" position. Even if the breaker is in the appropriate position, you may wish to turn it off, wait a few minutes, and then turn it back on. This will allow you to reset the system in the event that it shut down due to a power surge.
Check The Thermostat
If your air conditioner is still not turning on, you will need to focus your efforts on the thermostat. If you have a digital thermostat, begin by replacing the batteries in the unit. Next, check to make sure the desired temperature is set lower than the actual room temperature. If neither of these steps resolves the problem, you will need to disconnect the thermostat so that you can manually override the system.
In order to manually override the system, you will need to twist together the positive and negative wires that connect from your wall to the back of the thermostat. This can generate a small spark so you may wish to wear safety gloves or complete this task using a pair of rubber handled pliers.
Once the power circuit has been connected manually, your air conditioner should turn on. If the system does power on, this means that you are in need of a new thermostat and that replacing this part will correct the problem on a more permanent basis.
If you still are not getting any power, disconnect the two wires and contact an HVAC contractor. One company that provides this type of service is Kook & Son Inc.