Whirlpool · Washing Machine · Control Board Error

Whirlpool Washing Machine Error F21

Whirlpool washing machine error F21 usually indicates a control-board or communication fault. ECL records this code as “User Interface Communication Fault”. Common causes on this page include Loose connector and Display board fault, but the exact cause can vary by model and appliance generation. Keep to the external checks and safety guidance below; do not remove covers or test internal or live components, and arrange professional diagnosis if the code persists.

Quick answer: User Interface Communication Fault

In simple terms

Whirlpool washing machine code F21 usually means User Interface Communication Fault. Follow these four steps.

1Understand the code

See what the code usually means and why it may have appeared.

2Try safe checks

Try only the simple checks listed on this page. Do not take the appliance apart.

3Check if it is safe to use

Check the safety section before you keep using the appliance.

4Choose the next step

Use the next-step box to see whether to keep checking, find a part by model or get repair help.

What Whirlpool F21 means

The user interface and main board are not communicating correctly.

Repair help

Repair or replace?

Start with a repair option. If the appliance is older or the repair is expensive, you can then compare the cost of replacing it.

Get a repair option Compare replacement options

No obligation. Your contact details are only shared after you submit the repair request, and only with a suitable ECL Verified repairer where coverage is available.

Common causes

  • Loose connector
  • Display board fault
  • Main PCB fault

Safe checks you can make

  1. Unplug for 10 minutes

When to stop and call an engineer

If standard user maintenance does not clear the error, or if you suspect an electrical component failure.

Your model may be different

Error-code meanings can vary by model, market and appliance generation. Confirm Whirlpool F21 against the instruction manual or support information for the exact model number before replacing parts or treating this page as a model-specific diagnosis.

Where this information comes from

Publisher: Error Code Lookup Editorial Team. This page is independent information written in our own words and reviewed with safety boundaries in mind.

Manufacturer information: Whirlpool UK. Use the exact model number to verify model-specific wording and instructions.

Last reviewed: 2026-05-18

How Error Code Lookup researches and verifies pages · Report a correction or provide model-specific evidence

Frequently asked questions

What does F21 mean on a Whirlpool washing machine?

The user interface and main board are not communicating correctly.

What usually causes Whirlpool error F21?

Common causes include Loose connector; Display board fault; Main PCB fault.

Can I safely fix F21 myself?

This fault may require professional diagnosis or repair. Only basic external safety checks should be attempted.

When should I call a professional for F21?

If standard user maintenance does not clear the error, or if you suspect an electrical component failure.

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