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Error code reference

Electrolux Dryer Error Code E91

Communication Error between Electronic Control Board and Interface Board due to defective wiring, control…

Electrolux codesElectrolux dryer codes

Communication Error between Electronic Control Board and Interface Board due to defective wiring, control board, or interface board.

First step from the service manual

Check connections between Electronic Control Board and Interface Board. If no wiring problems, replace Electronic Control Board or Interface Board.

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

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What E91 means on a Electrolux dryer

The E91 error code on an Electrolux dryer indicates a communication failure between the Electronic Control Board and the Interface Board. These two boards work together continuously, exchanging data signals that coordinate user inputs from the control panel with the dryer's operating functions. When this communication link is interrupted or corrupted, the dryer cannot reliably process commands and will display E91 to alert the user and technician that the data pathway between these components has broken down.

The most common root cause is a wiring issue between the two boards. Connector pins can corrode, loosen, or sustain physical damage over time, particularly in the high-vibration, high-heat environment of a dryer. A damaged wire harness or a partially seated connector can intermittently break the communication signal, which may cause E91 to appear inconsistently before becoming a permanent fault.

If the wiring and connectors check out visually and electrically, the fault lies within one of the two boards themselves. Either the Electronic Control Board or the Interface Board may have a failed communication circuit, damaged solder joints, or component-level failures that prevent proper data exchange. Diagnosing which board is at fault typically involves substitution, since both boards must be able to send and receive signals correctly for the dryer to function.

Source: manufacturer service documentation.

Common causes of E91

  1. 01

    Loose or Disconnected Wire Harness Connector

    Wiring / connection

    The connector linking the Electronic Control Board to the Interface Board may have worked loose due to vibration or improper reassembly after a prior repair. Inspect each connector at both boards for a firm, fully seated connection.

  2. 02

    Corroded or Damaged Connector Pins

    Wiring / connection

    Pins inside the harness connectors can corrode or bend over time, breaking the signal path even when the connector appears seated. Look for discoloration, oxidation, or deformed pins at the connector ends on both boards.

  3. 03

    Damaged Wire Harness

    Part replacement

    The wire harness running between the two boards can develop breaks, chafing, or pinched sections from heat exposure or routing issues. Trace the full length of the harness and flex it gently while checking for continuity breaks.

  4. 04

    Faulty Interface Board

    Part replacement

    If all wiring checks out, the Interface Board itself may have a failed communication circuit or damaged component. Replacing the Interface Board is the next step when no wiring fault is found.

  5. 05

    Faulty Electronic Control Board

    Part replacement

    The Electronic Control Board can also be the source of the communication failure if its onboard communication circuitry has degraded or failed. This is typically evaluated after the Interface Board and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about E91

What does E91 mean on a Electrolux dryer?
E91 on an Electrolux dryer means there is a communication error between the Electronic Control Board and the Interface Board. The two boards are unable to exchange data signals properly, which prevents the dryer from processing commands. The cause is typically a wiring or connector issue, though one of the boards themselves may have failed.
How do I fix an E91 error on my Electrolux dryer?
Start by inspecting the wire harness and connectors between the Electronic Control Board and the Interface Board. Check that all connectors are fully seated and look for any signs of corrosion, bent pins, or wire damage. If the wiring appears intact, the next step is replacing the Interface Board or the Electronic Control Board, as one or both may have a failed communication circuit.
Will resetting my Electrolux dryer clear the E91 error?
A reset may temporarily clear the E91 code if the fault was caused by a transient signal disruption, but it will return if an underlying wiring or board issue is present. To prevent the code from recurring, the root cause, whether a loose connector, damaged harness, or faulty board, needs to be identified and corrected.
Is it safe to use my Electrolux dryer when it shows E91?
It is not recommended to continue using the dryer while E91 is active. The communication failure between the control boards means the dryer may not respond correctly to your inputs or safety-related commands. Operating the dryer in this condition could lead to unpredictable behavior or prevent the appliance from shutting off as intended.
How much does it cost to repair an E91 error on an Electrolux dryer?
If the fix is simply reseating a connector or addressing a minor wiring issue, the repair cost may be limited to a service call fee, typically in the range of $75 to $150. If a board replacement is needed, parts and labor combined can range from $150 to $400 or more depending on which board is at fault and local labor rates. Getting a diagnostic inspection before committing to parts replacement is advisable.

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