DIY window air conditioner repair

A window air conditioner cools the room it's in, so you get relief from the heat without using energy to cool the whole house. If your window AC unit isn't cooling well, don't sweat it. Sears PartsDirect has common symptoms and troubleshooting solutions for any make or model, as well as window air conditioner repair guides that walk you through repairs step by step.

If your window unit flashes an error code on the display, look it up on our error code charts to see what the problem is and how you can fix it. Find answers to common questions, simple tips for maintaining your window air conditioner and more in our articles and videos. To find the owner’s manual or a complete list of replacement parts for your window air conditioner, search for your model number.

Window Air Conditioners

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 ambient thermistor

If your window air conditioner isn’t cooling properly, it might need a new ambient thermistor. You can replace it yourself following these instructions.

Repair difficulty
Time required
 45 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.

September 26, 2019

Keeping your smart appliances secure from hackers

By Lyle Weischwill

Find out how to protect your smart appliances from malevolent invasions by hackers.

February 25, 2018

What to check when your air conditioner won't turn on video

By Sears PartsDirect staff

Try these easy fixes if your central AC won't start.

February 15, 2018

Prep your AC for summer video

By Sears PartsDirect staff

5 things to do to your central AC before it gets hot.

February 15, 2018

How to maintain your HVAC system video

By Sears PartsDirect staff

6 ways to extend the life of your HVAC system.

October 26, 2016

How to repair broken or damaged wires video

By Sears PartsDirect staff

Learn how to repair broken, frayed or damaged wires in your appliances.

April 15, 2016

How to maintain your window air conditioner

By Sears PartsDirect staff

These simple maintenance tips help your window air conditioner keep its cool.

February 23, 2016

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

By Sears PartsDirect staff

If your central air conditioner isn't cooling as it should, we'll show you how to check for a tripped float switch and clogs in the drain pipe.

January 18, 2016

How to use a multimeter to test electrical parts video

By Sears PartsDirect staff

Learn how to use a multimeter to check for wiring problems in an appliance that's not working

December 16, 2015

Using a wiring schematic to trace a current video

By Sears PartsDirect staff

Find out what’s wrong with your appliance by following a circuit.

December 9, 2015

How to read a wiring schematic video

By Sears PartsDirect staff

Learn how to decipher symbols so you can buy the right part for your problem.

December 2, 2015

Wiring schematic symbols explained video

By Sears PartsDirect staff

Learn some of the most common symbols found in a wiring diagram and what they mean.

January 29, 2015

Window air conditioner myths busted

By Sears PartsDirect staff

Let's clear up some misconceptions about room air conditioners.

January 20, 2015

How to fix a smelly room air conditioner

By Sears PartsDirect staff

Learn how to remove and prevent odors in a window air conditioner.

January 6, 2015

Troubleshooting a leaking room air conditioner

By Sears PartsDirect staff

Learn why water leaks from a room air conditioners and how to fix it.

December 22, 2014

Room air conditioner installation and operation tips

By Sears PartsDirect staff

Window air conditioner installation tips.

December 22, 2014

How to figure out which room air conditioner you need

By Sears PartsDirect staff

Grab your calculator and punch in these numbers to figure out how many BTUs your room AC needs to keep you cool.

November 1, 2014

Window air conditioner common questions

By Sears PartsDirect staff

Browse this list of questions we hear from our Sears PartsDirect customers most frequently, to see if we have the answer to your question.