The E3 error code in air conditioning units can have different meanings depending on the brand and model. Below are the possible causes and recommendations by brand:
Error E3: Fault in the indoor unit fan or blower
This applies to the following brands:
- Carrier
- General Electric
- Midea
- Samsung
- York
- Olimpia Splendid
- Bosch
- Daewoo
- Westinghouse
Recommendations for troubleshooting the fan issue:
a. Check the capacitor’s condition: A faulty capacitor may cause the fan to spin at a slow speed.
b. Inspect the blower turbine: Listen for unusual noises or blockages, which might indicate bearing problems.
c. Examine the fan’s speed sensor: Commonly a Hall-effect sensor, this may be malfunctioning.
d. Verify the power connections and relay: Ensure the fan is receiving the correct power supply.
Error E3: Low refrigerant gas or pressure
This applies to the following brands:
- Trane
- Green
- Haier
- Electrolux
- Sharp
- Kelvinator
Signs and solutions:
- Low electrical current: Check the power consumption using a clamp meter.
- Oil stains: Look for oil spots on the piping and connections, which can indicate a refrigerant leak.
Error E3 Specific Issues by Brand
- Trotec: Problem with the evaporator temperature sensor.
- Solution: Disconnect the sensor, measure its resistance with a multimeter, and confirm it matches the values in the manual.
- Fujitsu: Short circuit in the room temperature sensor.
- Toshiba: Connection error between the indoor unit and the control panel.
- Mitsubishi Electric and Panasonic: Communication issue with the remote control due to a lack of control signal transmission.
- Daikin:
- Activation of the high-pressure switch due to excessive pressure.
- Transformer failure caused by power issues, interfering with sensor signal interpretation.
