Error Code: F21 Difficulty: Hard
Problem: Water softener error.
How to Fix F21 Error (Step-by-Step)
- Begin by completely disconnecting the dishwasher from power by turning it off at the circuit breaker for at least 5-10 minutes. This allows the internal electronics to fully reset.
- Restore power to the dishwasher at the circuit breaker and confirm the error stays cleared during a full test cycle.
- For some models, this error requires entering a special check mode to clear. To do this, press and hold the ‘Rinse Only’ and ‘Delay Start’ buttons simultaneously for about 5 seconds, or until the panel lights change, indicating you have entered the service menu.
- Once in check mode, do not press any other buttons for at least one minute. The dishwasher will perform a self-check, which can help clear internal communication errors related to the water softener system.
- To finalize the reset and clear the code from memory, press the ‘Start/Cancel’ button for 3-5 seconds until the dishwasher drains and resets.
- Exit the check mode by pressing the main ‘Power’ button. If the error is cleared, the normal cycle selection should appear.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
What to Check Next on This Electrolux Dishwasher
Focused repair path: dishwasher fill, drain, wash, heat, latch, sensor, and control checks. Do not treat the fault as reset-only if it keeps returning; use the failed function to choose the next test.
- Disconnect power before opening panels, then confirm whether the Electrolux dishwasher repeats the same code after a clean reset.
- Match the symptom to the part of the cycle or function that fails: fill, drain, heat, cool, spin, latch, ignite, fan, sensor, or control response.
- Inspect simple causes first: airflow, water supply, drain path, door closure, filter, venting, wiring connectors, and visible damage.
- Use meter testing or service diagnostics before replacing electronic controls, because wiring, switches, sensors, and loads can mimic board failure.
- Use the complete Electrolux dishwasher model number from the appliance tag before ordering any model-specific part.
Check, inspect, clean, test, measure, remove, reconnect, clear, and replace parts only when the symptom supports that path. If these checks point toward a part, verify the complete Electrolux model number from the appliance tag before ordering.
Recommended Parts to Check
No exact official OEM part number is listed here because the correct Electrolux dishwasher part can vary by complete model number. These are targeted part-category searches, not universal fit claims.
-
Electrolux dishwasher drain pumpCommon replacement category: Drain pumpFit note: Exact OEM part number varies by complete Electrolux dishwasher model number. Confirm compatibility before buying.Why this category can matter: standing-water, drain, and incomplete-cycle symptoms after filter and hose checks.
-
Electrolux dishwasher water inlet valveCommon replacement category: Water inlet valveFit note: Exact OEM part number varies by complete Electrolux dishwasher model number. Confirm compatibility before buying.Why this category can matter: fill or low-water symptoms after supply and float checks.
-
Electrolux dishwasher control boardCommon replacement category: Electronic control boardFit note: Exact OEM part number varies by complete Electrolux dishwasher model number. Confirm compatibility before buying.Why this category can matter: repeating control faults after latch, wiring, and power checks.
Before ordering: match the part to the complete Electrolux dishwasher model number on the appliance tag.
When It’s Better to Replace Than Repair
Dishwasher repairs can add up quickly when the pump, control, heater, or leak-related parts fail.
Confirm cabinet width, water line, drain routing, electrical connection, and panel style before ordering.
For repair parts, verify exact fit with the full dishwasher model number before buying; these links are general replacement-appliance shopping options.
- [OK]Drain pump or circulation pump failure
- [OK]Leaking tub, door, or float-switch issues
- [OK]Heater or control failures on an older unit
- [OK]Repeated poor washing or drying performance
Recommended Dishwasher Replacement Options
As an Amazon Associate, we earn from qualifying purchases.
Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
More options (for a better recommendation)
⚡ Don’t Risk a DIY Fail!
Get the ‘Secret Service Mode’ Cheat Sheet for your Electrolux model. Includes an easy-to-read list of every error code and quick diagnostic tips.
✅ Join 15,000+ DIYers • Instant PDF Download
Browse More Codes
📖 View All Error Codes
Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
Read Editorial Standards →Browse all Electrolux error codes: Electrolux Error Codes
Leave a Reply