Troubleshooting 10 Most Common AC Problems

  • AC Running Constantly. …
  • AC Not Turning On. …
  • No Cool Air Flowing. …
  • Hot Air Blowing Out. …
  • Refrigerant or Water Leaking. …
  • Unit Turning On and Off Repeatedly. …
  • A/C System Freezing. …
  • Air Conditioner Tripping Circuit Breaker Repeatedly.

What are the common problems with air conditioners?

10 Common Air Conditioning Problems You Should Know About

  • Air Conditioner Is Not Turning On. …
  • Air Conditioner Not Blowing Cold Air. …
  • Air Conditioner Freezing Up Outside Unit. …
  • AC Refrigerant Leak. …
  • Air Conditioner Making Noises. …
  • Frozen Evaporator Coil. …
  • Electric Control Failure. …
  • Air Conditioner Leaking Water Outside.

Why is my air conditioner running but not cooling the house?

If your air conditioner is running, but not lowering temperatures inside, one issue could be a blocked or clogged condenser coil. When operating correctly, the condenser fan draws air into the outdoor unit through the condenser coil to pull heat energy out of your home.

How do you diagnose AC problems?

The Issue: Your AC Turns On But Isn’t Cooling

  1. Check the thermostat to make sure it’s working properly.
  2. Take a look at the condenser to see if it’s dirty or blocked. …
  3. Clean and/or change your filter (We recommend once a quarter.)
  4. See if any ice has formed on the coils. …
  5. Check and/or clean the outdoor compressor.


What is the most common air failure on an air conditioning system?

Air Conditioner Problem 8: Thermostat Malfunctioning



One of the most common problems with home air conditioners is the thermostat malfunctioning.

How do I fix my air conditioner that is not cooling?

The following are a few things to check when your air conditioner is not cooling your space.

  1. Check and reset the thermostat. …
  2. Replace the dirty filter. …
  3. Clear the clogged condensation drain. …
  4. Try to diagnose duct malfunctions. …
  5. Clear the area around the compressor.


Why is my house so hot even with AC on?

Air leaks and poor insulation are a common cause for making your house feel hot, even when the AC is working, as they can allow the air your air conditioner has worked so hard to cool to escape, leaving your house hot. Humidity can interfere with your thermostat’s ability to track temperatures and also traps heat.

How do I know if my home AC compressor is bad?

5 Signs & Symptoms of a Bad AC Compressor

  1. Your AC Is Making Growling, Screeching, or Clattering Noises. Electrical failures in the compressor will make your AC emit unusual clunking or rattling noises. …
  2. You Have a Hard Time Getting Your AC to Start. …
  3. Your AC Stops Blowing Cold Air. …
  4. Circuit Breaker Problems. …
  5. Diminished Airflow.


How much does a new compressor cost for an air conditioner?

AC Compressor Replacement Cost



According to data by HomeGuide, the average cost to replace a home air conditioner compressor is about $600 to $1,200 under warranty, or $1,300 to $2,500 when it’s not under warranty. Many HVAC contractors charge $100 to $150 per hour plus the cost of parts to repair a home AC compressor.

How do you tell if a compressor is burnt out?

But perhaps the simplest method is the “odor test.” The smell that comes when a hose is connected to the system is both pungent and revealing. Once sniffed, it’s never forgotten and is one of the best indicators of a compressor burn-out.

How do you know if your air compressor is going out?

Signs of Compressor Failure



You might notice that your home isn’t staying as cool as it used to or that the air coming out of the vents isn’t cool at all. Reduced airflow is another sign. When compressors start struggling, they cannot create as much cold air.

What does a bad AC compressor sound like?

So if you turn on your AC and hear a rattle, it may mean you have a failing or bad: AC compressor. Rattling or your car air conditioner making loud humming noises which get worse as you accelerate can both be signs you need to replace your AC compressor.

Will AC fan run if compressor is bad?

Inappropriate maintenance of the AC compressor sometimes can lead to its malfunctioning. An air conditioning unit can still appear to run with a malfunctioning HVAC compressor. AC unit is equipped with a pair of fans, which still can run even in case of a malfunctioned compressor.

What happens when AC compressor goes bad?

A failed or bad air conditioning compressor will not circulate refrigerant in the air-con system, and the outcome will be warm air coming through the AC vents. So, when the AC compressor fails, you’ll notice high degrees and hot airflow inside the car.

Can AC compressor be repaired?

Can A Broken AC Compressor Be Fixed? Absolutely! If you know what to look for, you may be able to head off the problem with your AC unit before the weather gets too hot.

What causes AC compressor to stop working?

Reasons Why Your AC Compressor Has Stopped Working



It is important to examine the unit to find the problem. Some of the common issues include tripped circuit breakers, broken thermostats, dirty and dusty air filters, or a blown fuse. Clogged or dirty filters often cause an AC compressor to stop working.