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Error code reference

Electrolux Air Conditioner Error Code F1

Indoor ambient temperature sensor open or short circuited.

Electrolux codesElectrolux air conditioner codes

Indoor ambient temperature sensor open or short circuited.

First step from the service manual

Check wiring terminal connection between temperature sensor and mainboard; verify sensor resistance against resistance table.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F1 means on a Electrolux air conditioner

The F1 error code on an Electrolux air conditioner indicates a fault with the indoor ambient temperature sensor, also called the room temperature thermistor. This sensor is a negative temperature coefficient (NTC) resistor located in the indoor unit that continuously monitors the air temperature returning to the unit. The mainboard uses this data to regulate compressor operation, fan speed, and overall cooling or heating cycles. When the mainboard detects that the sensor signal falls outside the expected voltage range, it flags an open circuit (broken wire or failed sensor with infinite resistance) or a short circuit (sensor resistance has dropped to near zero), and triggers the F1 code.

The most reliable way to diagnose F1 is to start at the wiring terminal where the sensor connects to the mainboard. A loose, corroded, or disconnected terminal plug is the most frequent cause of this fault and can be confirmed visually. If the wiring appears intact, the sensor itself should be tested with a multimeter set to resistance mode. A functioning NTC thermistor will show a specific resistance value that changes predictably with temperature, and the resistance table for your specific model defines the expected ohm readings at various ambient temperatures. A reading of infinite resistance points to an open circuit, while a reading near zero ohms indicates a short.

If the wiring and connector check out but resistance readings are outside the specified range, the sensor requires replacement. In some cases the mainboard itself may misread a healthy sensor due to a damaged input circuit, though this is less common. Always verify sensor resistance at the sensor connector before condemning the board.

Source: manufacturer service documentation.

Common causes of F1

  1. 01

    Loose or disconnected sensor wiring terminal

    Wiring / connection

    The connector plug between the temperature sensor and the mainboard can loosen over time due to vibration or handling during maintenance. Inspect the terminal block for a partially seated or unplugged connector.

  2. 02

    Failed indoor ambient temperature sensor (open circuit)

    Part replacement

    The NTC thermistor can fail internally, causing its resistance to read as infinite on a multimeter. This open-circuit condition is a definitive sign the sensor must be replaced.

  3. 03

    Shorted indoor ambient temperature sensor

    Part replacement

    Moisture intrusion or physical damage to the sensor can cause the resistance to drop to near zero ohms. Compare the measured resistance against the resistance table for your model to confirm a short.

  4. 04

    Damaged or corroded sensor wiring

    Part replacement

    The wire harness running from the sensor to the mainboard can develop breaks, pinches, or corrosion at connection points. Inspect the full length of the wire for visible damage or oxidation at the terminals.

  5. 05

    Faulty mainboard sensor input circuit

    Part replacement

    If the sensor and all wiring test within the specified resistance values but the F1 code persists, the mainboard's input circuit may be damaged and unable to read the sensor signal correctly.

See the test procedure for each cause

Frequently asked questions about F1

What does F1 mean on a Electrolux air_conditioner?
F1 on an Electrolux air conditioner indicates that the indoor ambient temperature sensor has been detected as open or short circuited. The mainboard monitors the resistance signal from this NTC thermistor to read room temperature. When the signal falls outside the expected range, the unit stops normal operation and displays F1. The fault can originate at the sensor itself, its wiring, or the connector terminal on the mainboard.
How do I fix an F1 error on my Electrolux air conditioner?
Start by checking the wiring terminal that connects the indoor ambient temperature sensor to the mainboard, ensuring the connector is fully seated and free of corrosion. Next, use a multimeter to measure the sensor's resistance and compare the reading against the model's resistance table. If the sensor reads near infinite or near zero ohms, replace the sensor. If the sensor measures correctly, inspect the wire harness for damage and, as a last step, consider the mainboard.
Is it safe to run my Electrolux air conditioner with an F1 error showing?
Running the unit while the F1 code is active is not recommended. The air conditioner cannot properly regulate its operation without accurate room temperature data, which can lead to improper cycling and potential stress on the compressor. Most Electrolux units will restrict or suspend normal operation automatically when F1 is displayed. Addressing the sensor fault before continued use is the safest approach.
How much does it cost to repair an F1 error on an Electrolux air conditioner?
If the fix is simply reseating a loose connector, there may be no parts cost and only a service call fee, which typically ranges from $50 to $100 or more depending on your area. Replacing the indoor ambient temperature sensor is generally inexpensive, with parts commonly ranging from $10 to $40. If the mainboard requires replacement, costs can rise considerably, often falling in the $150 to $400 range for parts alone before labor.
Will resetting my Electrolux air conditioner clear the F1 error?
A power reset may temporarily clear the F1 code if the fault was caused by a momentary signal issue, but the code will return if the underlying problem with the sensor or its wiring is still present. Resetting the unit does not repair a failed sensor or a damaged connector. Performing the proper resistance test on the sensor after a reset is the only reliable way to confirm whether the fault has been resolved.

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