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Error code reference

Electrolux Air Conditioner Error Code F5

Outdoor discharge temperature sensor open or short circuited.

Electrolux codesElectrolux air conditioner codes

Outdoor discharge temperature sensor open or short circuited.

First step from the service manual

Check discharge sensor connection and verify head is inserted into copper tube; verify resistance using sensor resistance table.

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

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What F5 means on a Electrolux air conditioner

The F5 error code on an Electrolux air conditioner indicates a fault with the outdoor discharge temperature sensor, which monitors the temperature of refrigerant as it exits the compressor. This sensor is a thermistor, meaning its electrical resistance changes predictably with temperature. The control board uses these resistance readings to protect the compressor from overheating and to manage system efficiency. When the board detects a resistance value outside the expected range, it interprets this as either an open circuit (infinite or excessively high resistance) or a short circuit (near-zero resistance) and triggers the F5 fault.

The sensor itself is a small probe that must be physically seated inside a pocket or sleeve on the copper discharge tube to read temperatures accurately. If the sensor head is not fully inserted into that copper tube fitting, readings will be erratic or out of range even if the sensor wiring is intact. This is a common installation or vibration-related issue. The correct procedure is to verify the physical seating of the sensor head first, then use a multimeter to measure the sensor's resistance and compare that value against the sensor resistance table provided in the unit's specifications.

A confirmed open circuit reading typically points to a broken wire, corroded connector, or a failed thermistor element inside the sensor probe. A confirmed short circuit reading usually indicates internal sensor failure or a wiring harness that has chafed against a metal component, creating an unintended ground path. In either case, the sensor or its wiring must be repaired or replaced before the unit will resume normal operation.

Source: manufacturer service documentation.

Common causes of F5

  1. 01

    Sensor head not seated in copper tube

    Wiring / connection

    If the discharge sensor probe has vibrated loose or was never fully inserted into its copper tube pocket, the sensor cannot read accurately and the board registers an out-of-range signal. Visually inspect the sensor head position and press it firmly into the fitting.

  2. 02

    Loose or corroded connector

    Wiring / connection

    The connector between the discharge sensor and the control board can loosen over time or develop corrosion, causing intermittent or lost continuity. Disconnect and reseat the connector, inspecting the terminals for oxidation or pin damage.

  3. 03

    Failed discharge temperature sensor

    Part replacement

    The thermistor element inside the sensor probe can fail, producing resistance values that are either too high (open) or too low (short) compared to the expected resistance table. Measure sensor resistance with a multimeter and compare to the rated values; replace the sensor if readings are out of specification.

  4. 04

    Damaged wiring harness

    Part replacement

    Wiring between the sensor and the control board can chafe against the outdoor unit cabinet or copper lines, creating a short to ground or a broken conductor. Trace the harness visually and check for abrasion points, especially near metal edges or vibrating components.

  5. 05

    Faulty control board

    Part replacement

    If the sensor and wiring both test within specification but the F5 fault persists, the control board's sensor input circuit may have failed. This is the least common cause and should only be considered after the sensor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about F5

What does F5 mean on a Electrolux air_conditioner?
The F5 code means the outdoor discharge temperature sensor has been detected as either open or short circuited by the control board. This sensor monitors refrigerant temperature leaving the compressor and uses resistance values to communicate with the board. When those resistance values fall outside the expected range, the system triggers F5 and halts operation to protect the compressor.
Can I fix the F5 error myself, or do I need a technician?
Some causes of F5 are straightforward to address, such as reseating a loose sensor head in the copper tube or reconnecting a loose wiring connector. However, testing sensor resistance against a specification table requires a multimeter and some familiarity with electrical testing. If the sensor or control board needs replacement, most homeowners will want to call a qualified technician, particularly because working inside the outdoor unit involves electrical components.
Is it safe to run my Electrolux AC with an F5 error?
No, you should not continue running the unit with an active F5 error. The discharge temperature sensor is a safety component that prevents the compressor from overheating. Without reliable readings from this sensor, the control board cannot protect the compressor from potentially damaging high-temperature conditions, which could lead to compressor failure.
Will resetting the unit clear the F5 error code?
A power reset may temporarily clear the F5 fault display, but the code will return if the underlying sensor or wiring problem has not been repaired. Resetting without fixing the root cause does not resolve the fault and can mask a condition that may cause further damage. The sensor connection and resistance values should be verified before relying on a reset.
How much does it cost to repair an F5 error on an Electrolux air conditioner?
Repair costs depend on the specific cause. If only a connector needs reseating, there may be no parts cost and minimal labor. Replacing a discharge temperature sensor typically involves parts costs in the range of $20 to $80 and a service call fee that varies by region. If the control board has failed, parts and labor combined can range from $150 to $400 or more depending on the model and local labor rates.

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