Written by
Jordan Avery Appliance Repair Content SpecialistPublished August 17, 2026Technically reviewed August 19, 2026
Content status:
Verified
Error codeEr09
ApplianceDishwasher
Affected model seriesEIDW6105, EIDW5905
Quick answer
Electrolux dishwasher code Er09 indicates communication failure between the user board and power supply.
Model compatibility: Electrolux reuses codes across series and control generations, so Er09 may mean something different on another appliance or platform. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Electrolux dishwasher code Er09 points to communication failure between the user board and power supply. The display narrows the diagnostic path, but it does not prove which component should be replaced. Use the observed symptoms and the full model number to confirm the correct diagnostic path.
On this Electrolux platform, the code is a starting point for diagnosis: communication failure between the user board and power supply. The visible behavior matters: controls may become unresponsive can occur with control-board communication issue, but wiring or connector problem remains another documented possibility.
This code is documented in Electrolux EIDW6105/EIDW5905 service data. Confirm the exact model before applying this diagnostic path.
Signs
Symptoms you may notice
controls may become unresponsive
cycle may stop unexpectedly
code may return after power-up
Why it happens
Possible causes
control-board communication issue
wiring or connector problem
configuration or state-machine error
power-supply issue
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Turn the dishwasher off at the breaker for several minutes.
Restore power and try one normal cycle.
Do not remove the console or control-board covers.
If the code returns, stop repeated reset attempts.
Important safety warning. Stop user-level troubleshooting after one safe reset if the code returns.
Get help
When to call a technician
A recurring Er09 control code needs model-specific board, wiring, and communication checks.
Do not erase useful context with repeated resets. If Er09 returns, note whether controls may become unresponsive and provide the full model number so control-board communication issue can be tested in the correct platform sequence.
Seeing this code on your Electrolux appliance?
If the code returns after the safe checks, book a repair visit and share the exact display plus your full model number.
Electrolux Dishwasher Repair for common Electrolux problems, safe troubleshooting, error-code context, and signs it is time to schedule professional service.
It indicates communication failure between the user board and power supply. Confirm the full model number because Electrolux diagnostic meanings can vary between control platforms.
You can try the safe external checks on this page and one power reset when appropriate. If the code returns, repeated resets are not a substitute for diagnosis.
If the code clears after one reset and operation is normal, one test cycle is reasonable. If it returns, arrange diagnosis.
References
Sources & references
Electrolux EIDW6105/EIDW5905 service data sheet 154676604.
Ready to get your Electrolux appliance working again?
Book a repair visit and share your full model number plus any displayed code so diagnosis can start on the right path.
