How do you fix E4 error on an air conditioner?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

If your air conditioner is displaying the E4 error code, there are a few things you can do to try and fix the problem. First, check to make sure that all of the air filters are clean. If they are dirty, replace them with clean ones. Next, check the air conditioner's coils and evaporator to see if they are dirty. If they are, clean them with a coil cleaning solution. Finally, check the air conditioner's condenser to see if it is dirty. If it is, clean it with a condenser cleaning solution. If the air conditioner is still displaying the E4 error code after completing these steps, it may need to be serviced by a professional.

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1. Check the air filter and clean or replace it if necessary

The steps to check and clean the air filter on an air conditioner are as follows:

  1. Disconnect the power cord from the air conditioner.
  2. Open the air conditioner's front cover.
  3. Locate and remove the air filter.
  4. Wash the air filter in a clean water solution.
  5. Place the air filter back in position and replace the front cover.
  6. Connect the power cord to the air conditioner and turn it on.

2. Inspect the evaporator coils and clean them if they are dirty

  1. Open the front cover of the AC unit and check for any obstructions in the evaporator coils. If there are any, use a vacuum cleaner to clear them.
  2. Turn on the AC unit and let it run for a few minutes. This will help to circulate the air and help to clean the evaporator coils.
  3. Use a vacuum cleaner to clean the evaporator coils. Be sure to use the correct cleaning solution and be careful not to damage the coils.
  4. Check the coils for any signs of wear or damage. If there is damage, replace the coils.

3. Inspect the condenser coils and clean them if they are dirty

First, turn off the air conditioner and let it cool before beginning. Next, remove the cover on the condenser coil. If the coils are dirty, use a stiff brush to clean them. Make sure to get into all the nooks and crannies. Once the coils are clean, replace the cover and reattach the wires. Turn on the air conditioner and check for the e4 error. If the error is gone, the coils were probably clean.

4. Inspect the outdoor air compressor and make sure it is properly sealed

To inspect the outdoor air compressor, one would remove the cover and inspect the compressor for proper seal. If the seal is not proper, the compressor may not be able to operate properly and may produce an "e4" error on an air conditioner.

If the answers above didn't work then you should also try:

  1. Inspect the indoor air handler and make sure it is properly sealed.
  2. Have a professional service technician check the air conditioner for any other potential issues.