Troubleshoot error code “E4” in Hyundai air-conditioning

How to eliminate E4 error in Hyundai air conditioning?

  • Error: E4
  • Description: Open or short internal unit temperature sensor
  • Cause: This sensor may be open or shorted
  • Solution: Change temperature sensor (copper tip)

In this article we explain what this error means, what causes it and how you can fix it yourself.

What does the E4 error mean?

The E4 error in a Hyundai air conditioner indicates that there is a problem with the temperature sensor of the internal unit of the device. This sensor is responsible for measuring the temperature of the air in the room and sending that information to the air conditioner’s control system so that it can regulate the temperature properly. If this sensor fails, the device will not be able to function properly and will display the E4 error on the screen.

What are the causes of the E4 error?

The most common cause of the E4 error in a Hyundai air conditioner is a problem with the internal unit temperature sensor. This sensor may be open or shorted, causing the device to be unable to measure the temperature correctly. It may also be that the sensor is dirty or damaged due to a bump or drop.

How to fix the E4 error?

The most common solution for the E4 error in a Hyundai air conditioner is to replace the internal unit temperature sensor. To do this, you will need to purchase a new copper temperature sensor of the same value as the one currently installed in your device. Then, follow these steps:

  1. Disconnect the air conditioner from electrical power and remove the cover from the indoor unit.
  2. Locate the temperature sensor on the indoor unit. This sensor is usually located near the evaporator coil.
  3. Disconnect the temperature sensor wire from the air conditioner control board.
  4. Remove the temperature sensor from the indoor unit.
  5. Install the new copper temperature sensor in the same location as the old one.
  6. Connect the new temperature sensor wire to the air conditioner control board.
  7. Replace the indoor unit cover.
  8. Connect the air conditioner to the power supply and turn it on to check if the E4 error has disappeared.

What to do if the error persists?

If after replacing the indoor unit’s temperature sensor the E4 error still appears on the air conditioner’s display, it is possible that the problem is more complex and requires the intervention of a specialized technician. In this case, it is best to contact an authorized Hyundai service technician so they can do a more detailed check of the device and troubleshoot whatever is causing the error.

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