How to Resolve Error E4 in Air Conditioners?

Error E4 is a code that varies depending on the brand and type of air conditioner. Below, we outline the most common causes of this error and potential solutions by brand:

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Error E4 in Different Brands and Models

General Electric (GE)

• Portable Models:
  • Cause: Display panel communication error.
  • Solution:
    1. Turn off and restart the unit by unplugging it for 30 seconds before plugging it back in.
    2. Check the wiring between the display panel and the unit.
    3. If the issue persists, update the unit’s software or contact a technician.
• Window Models:
  • Cause: Full drain pan.
  • Solution:
    1. Turn off the unit.
    2. Locate the drain pan and empty the accumulated water.
    3. Check for possible obstructions in the drain line or the air coils.

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Carrier

• Indoor Units:
  • Cause: Open or short circuit in the ambient temperature sensor (T1).
• Outdoor Units:
  • Cause: Open or short circuit in the temperature sensor.

General Solution for Carrier: Contact technical support for a sensor inspection.

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Midea

• Outdoor Units:
  • Cause: High-temperature protection or faulty temperature sensor.
• Portable Models:
  • Cause: Display panel communication error.

Solution: Restart the unit by unplugging it. If the error persists, contact authorized technical support.

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Samsung

• Cause: Forced defrost due to low refrigerant levels, a defective pump, or a damaged temperature sensor.
• Solution: Contact the nearest Samsung service center for a comprehensive inspection.

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York

• Standard Models:
  • Cause: Failure in the ambient temperature sensor.
• Central Models:
  • Cause: Malfunction in the T2B temperature sensor of the discharge pipe.

Solution: Replace or repair the temperature sensor with the help of a technician.

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Bosh, Westinghouse, and Other Brands

• Common Cause: Open or short circuit in the ambient temperature sensor (T1).
• Solution: Check the integrity of the sensor. If it is damaged, replace it.

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Gree and Electrolux

• Cause: High-temperature protection in the compressor exhaust.
• Solution:
  1. Turn off the unit and let it cool down.
  2. If the error persists, request technical assistance.

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Haier and Sharp

• Cause in Indoor Models: EEPROM issues or a full water tank (portable models).
• Solution: Empty the water tank and check the internal software status.

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Fujitsu and Kelvinator

• Cause: Open indoor coil thermistor or high-temperature discharge protection.
• Solution: Request a thermistor replacement or adjust refrigerant pressure.

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Daikin

• Cause: Low-pressure switch (LBS) activation, indicating insufficient system pressure.
• Solution: Recharge the refrigerant and inspect the system for leaks.

We have prepared a playlist that, in addition to detailing the procedures to resolve the E4 error code in air conditioners from the previously mentioned brands, also includes information on brands such as Mr. Cool, Dawlance, AUX, Lennox, and Bluestar.