February 23, 2016

What to check if your air conditioner isn't cooling video

By Sears PartsDirect staff
What to check if your air conditioner isn't cooling.
What to check if your air conditioner isn't cooling.

If your central air conditioner isn't cooling like it should be, there are a few things you can check before calling for service. In this video from Sears PartsDirect, learn why the float switch may have shut down your air-conditioning unit and how you can fix it by removing clogs in the drain pipe. Also, learn how simple monthly maintenance can prevent clogs in the future.

If you're looking for other DIY help for your appliances or lawn and garden equipment, check out our repair help section for symptoms and troubleshooting advice, error codes, repair guides and replacement parts.

Check for Clogged Drain

Hi, this is Wayne with Sears Parts Direct. Is your central air conditioner not keeping things as cool as it should be? Here’s something to check before you make that call for service. Many central air conditioners have a drain float switch that shuts the system down if the drain is clogged and water backs up under the evaporator. If this switch trips, the air conditioner will shut down to avoid water damage.

If this well under the switch is full, then it's time to unclog the drain line. You may be able to remove the clog with a shop vac. If not, you can use a plumber's snake to clear the drain line.

Bleach Prevents Drain Clogs

To keep this thing from clogging up in the future, pour a cup of liquid bleach down the drain vent tube every month. The bleach kills mold and mildew that can build up inside the drain pipe and hose. To keep from killing the grass in your yard, stick a pan under the drain hose outside to catch the bleach as it runs out. And always remember to protect your eyes and skin when handling bleach and other harsh chemicals. You can get in the habit of doing this at the same time you change your air filter. You remember to do that every month, right?

Hey, thanks for watching. I hope this video helped your out today. Be sure to check out our other videos here on the YouTube Channel and don’t forget to subscribe.

Symptoms for window air conditioners

Choose a symptom to see related window air conditioner repairs.

Main causes: dirty air filter, air conditioner is too small for the room, temperature set too cold, control failure
Main causes: turning the air conditioner off and the back on too quickly, dirty or restricted condenser coil, compressor failure
Main causes: clogged condensate drain, air conditioner not leveled properly, leaky window air seals
Main causes: lack of electrical power, bad electronic control board, wiring failure, bad temperature sensor
Main causes: clogged drain hole, air conditioner not leveled properly
Main causes: bad compressor, lack of refrigerant, bad compressor start relay, electronic control board failure

Repair guides for window air conditioners

These step-by-step repair guides will help you safely fix what’s broken on your window air conditioner.

How to replace a window air conditioner user interface control board

Control buttons or lights on the user interface control board can stop working. This repair guide shows how to replace it.

Repair difficulty
Time required
 30 minutes or less
How to replace a window air conditioner condenser fan

If the condenser fan blade is broken or the condenser fan motor won’t run, you can replace the broken parts yourself by following these instructions.

Repair difficulty
Time required
 90 minutes or less
How to replace a window air conditioner electronic control board

The electronic control board is the brain of your window air conditioner. Here’s how to replace it.

Repair difficulty
Time required
 45 minutes or less

Articles and videos for window air conditioners

Use the advice and tips in these articles and videos to get the most out of your window air conditioner.

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