What Does Error Code E91 Mean on an Electrolux Washing Machine?
Reset the machine by switching it off at the wall, waiting 5 minutes, then switching it back on — this clears temporary communication faults and restores normal operation in most cases (takes about 5 minutes).
Fault description
Error code E91 on an Electrolux washing machine signals that the main control board (PCB) has lost communication with the display board or a connected sub-module. These two components constantly exchange data during a wash cycle, and if that signal is interrupted or corrupted, the machine stops and displays E91 to prevent further operation.
When this error appears, the machine will typically halt mid-cycle or refuse to start at all. The display may freeze, flash, or become unresponsive. In some cases the drum will stop spinning and the door may remain locked until the fault is cleared.
The good news is that E91 is often caused by a temporary software glitch or a loose wiring connection rather than a failed component, so a straightforward reset or a quick inspection of the wiring harness resolves many cases without any parts being needed.
Causes
- Temporary software or firmware glitch — A brief power fluctuation or an interrupted cycle can cause the main PCB and display board to fall out of sync. This is the most common trigger and usually clears with a full power reset.
- Loose or disconnected wiring harness — The ribbon cable or wiring loom connecting the main PCB to the display board can work loose over time due to vibration during spin cycles. A partially seated connector is enough to break communication entirely.
- Damaged or corroded wiring connector — Moisture inside the machine, particularly around the door seal area, can cause corrosion on the connector pins between the PCB and display board. Corroded pins create high resistance that disrupts the data signal.
- Faulty display board — If the display board itself has developed an internal fault — due to a power surge, component failure, or physical damage — it will stop responding to the main PCB. The machine interprets this silence as a communication error.
- Faulty main PCB — Less commonly, the main control board is the source of the problem. If the PCB's communication circuit has failed, it cannot send or receive data regardless of the condition of the display board or wiring.
Step-by-Step Fix
- 1
Perform a full power reset
Switch the machine off using the power button, then turn it off at the wall socket and unplug it completely. Leave it unplugged for at least 5 minutes to allow the capacitors on the PCB to fully discharge, then plug it back in and run a short test cycle. This clears temporary communication faults in a significant number of cases.
- 2
Check for a programme selector or button stuck in position
A jammed programme dial or a stuck button can send a continuous signal that confuses the control board. Turn the programme selector through its full range and press each button to confirm none are physically stuck or depressed. If a button feels sticky or unresponsive, clean around it with a dry cloth.
- 3
Inspect the wiring harness between the display panel and the main PCB
Unplug the machine before doing this. Remove the top panel (usually held by two screws at the rear) to access the wiring. Locate the ribbon cable or connector loom running from the display board down to the main PCB and press each connector firmly until it clicks into place. Look for any visible signs of chafing, pinching, or burn marks on the cables.
- 4
Check connector pins for corrosion
With the machine still unplugged, disconnect the wiring connectors between the display board and the PCB one at a time. Examine the metal pins inside each connector for green or white discolouration, which indicates corrosion. Gently clean affected pins with a dry cotton swab or a small amount of electrical contact cleaner, allow to dry fully, then reconnect.
- 5
Test the machine after reconnecting all wiring
Reassemble the top panel, plug the machine back in, and run a full wash cycle to see if E91 returns. If the error is gone, monitor the machine over the next few washes to confirm the fault has been resolved. If E91 reappears after a few cycles, the issue is likely a failing component rather than a loose connection.
- 6
Consider replacing the display board
If the wiring is secure and undamaged but E91 persists, the display board is the next most likely culprit. Source a compatible replacement board using your machine's full model number (found on the label inside the door frame). Fitting a new display board is generally straightforward — disconnect the old board, transfer the connectors to the new one, and reassemble.
- 7
Arrange a service technician visit if the fault continues
If replacing the display board does not resolve E91, the main PCB is likely at fault. PCB diagnosis and replacement requires specialist tools and knowledge of the machine's circuit layout, so this step is best left to a qualified service technician.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
If E91 returns immediately after a power reset, or if the display is completely blank and unresponsive even when the machine is powered on, the fault is unlikely to be a simple wiring issue. Similarly, if you can see burn marks, melted plastic, or smell something electrical near the control panel or rear of the machine, stop using it immediately and do not attempt further DIY investigation.
A service technician should also be called if you have already replaced the display board and the error persists, as this points to a main PCB fault that requires proper diagnosis with electronic test equipment before any further parts are ordered.
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Frequently Asked Questions
Will E91 clear itself if I leave the machine for a while?
Sometimes. If the error was triggered by a brief power fluctuation or a temporary software glitch, switching the machine off at the wall for 5-10 minutes and restarting it may be enough to clear it. However, if there is an underlying wiring or component fault, the error will return as soon as the machine tries to run a cycle.
Is it safe to use the machine while it shows E91?
No. When E91 is active, the main PCB cannot reliably control the machine because it has lost communication with the display board. Running the machine in this state could result in the cycle not completing correctly, the door remaining locked unexpectedly, or further damage to the control electronics. Switch the machine off until the fault is resolved.
How do I find the model number on my Electrolux washing machine?
The model number is printed on a label inside the door opening, usually on the front edge of the drum housing or on the door frame itself. It typically starts with letters followed by a series of numbers. You will need this number to order the correct display board or PCB for your specific machine.
Could a software update fix the E91 error?
On some Electrolux models, firmware updates can address communication issues between the PCB and display board. However, firmware updates for washing machines are not something homeowners can apply themselves — this would need to be carried out by a service technician using manufacturer diagnostic equipment.
How much does it typically cost to repair an E91 fault?
If the fix is a simple power reset or reseating a connector, there is no parts cost at all. A replacement display board typically costs between £30 and £80 depending on the model. A main PCB is more expensive, often £80 to £150 or more for the part alone, plus labour if a service technician fits it. Getting a repair quote before ordering parts is always a sensible step.