April 20, 2023

Heating and air conditioning system repair guides

When your HVAC system goes out, you'll want to fix it fast so you're not miserable inside your home. These step-by-step repair guides show you how to complete common repairs such as clearing a condensate drain line or installing a new control thermostat. And we have more helpful information on our heating and air conditioning repair help page, like symptoms and solutions for top HVAC brands such as Kenmore, Carrier and Lennox. Search your model number to find a complete list of replacement parts, then order the part you need.

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Repair guides for Repair guides common to all heating & cooling combined units

These step-by-step repair guides will help you safely fix what’s broken on your HVAC system.

How to unclog the air conditioner drain line
March 16, 2022

How to unclog the air conditioner drain line

The condensate drain line for your central air conditioner can clog with mold and mildew. Water will back up and start d…

Repair difficulty
Time required
 15 minutes or less
How to replace the furnace flame sensor
March 16, 2022

How to replace the furnace flame sensor

The flame sensor detects when furnace burner flames are lit. You may need to replace the flame sensor if flames only sta…

Repair difficulty
Time required
 15 minutes or less
How to replace a heating and air conditioning system thermostat
March 03, 2022

How to replace a heating and air conditioning system thermostat

The control thermostat for your HVAC system can stop working. This repair guide shows how to replace it.…

Repair difficulty
Time required
 30 minutes or less

Symptoms common to all heating & cooling combined units

Choose a symptom to see related heating and air conditioning system repairs.

October 25, 2023

Thermostat problem, clogged air filter, burner failure…

April 20, 2023

Dirty air filter, clogged condenser coils, low refrigerant charge, faulty compressor…

April 20, 2023

Thermostat problems, bad compressor/condenser fan capacitor, lack of refrigerant, failed compressor…

April 20, 2023

Main causes: errant thermostat settings, lack of electrical power, clogged drain line, wiring failure, control failure.…

April 20, 2023

Main causes: Errant thermostat settings, lack of power, bad interlock switches, lack of exhaust ventilation, wiring fail…

April 20, 2023

Dirty flame sensor, failed flame sensor, damaged burner, bad high limit switch…

Articles and videos common to all heating & cooling combined units

Use the advice and tips in these articles and videos to get the most out of your HVAC system.

Maintaining your air conditioner
May 24, 2023

Maintaining your air conditioner

Learn how to maintain your central air conditioner to keep it running smoothly all summer long.…

How to prevent the 2 most common AC failures from ruining your summer
May 19, 2023

How to prevent the 2 most common AC failures from ruining your summer

Get tips to help keep your central AC running all summer long…

Top questions about Sears and Sears PartsDirect
June 29, 2022

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…