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How To Troubleshoot A Window Air Conditioner

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When you don't have central air in your home, a window air conditioner is the next best thing. It provides cool air in the room it is installed in, and often times can provide cool air to nearby rooms as well. If you are having trouble with the appliance, it is time to do some troubleshooting. Here are some common problems with these A/C units and how to address them.

Does the air conditioner turn on?

One of the most common issues with window air conditioners is when they refuse to turn on altogether. As with all electrical appliances, you should check the power supply and the cords first. This might seem obvious, but in many cases, the fuse has blown or the cord has slipped out of the outlet just slightly. Make sure you have tried the switch in that room if there is a switch that works with that outlet. In addition, check the condition of the cord. If the cord is in the outlet and the outlet switch is turned on, check the fuse box next. Make sure the fuse is in the up position for the unit.

Is it turning off and on randomly?

Another problem you might be experiencing with your window air conditioner is having it turn off and on randomly, or frequently. Many window units are on an automatic setting, so it turns on when the room reaches the temperature you have programmed into the thermostat. However, when it keeps turning off and on, it is often a problem with the thermostat as it can't tell what the room's temperature is. The first thing to check is the temperature sensor, which will be located close to the evaporator coils. If it looks to have damaged wire, you will need to have it replaced. Also be sure the thermostat is not obstructed by build-up or because curtains are blocking it.

Is there condensation?

If you notice a lot of condensation, or water, leaking out of the front of the unit when it is turned on, this is likely due to the pan's angle. The pan might be sloping at the wrong angle, causing the condensation to go back into the unit instead of outside where it is meant to go. Check the drain pan and adjust it so that all water and condensation leads outside. If this still doesn't solve the problem, you might need to get repairs.

For any other problems, contact an HVAC professional like MJM Mechanical to fix your window air conditioner.