Whirlpool · Dishwasher · Motor Fault

Whirlpool Dishwasher Error FB

Whirlpool dishwasher error FB usually indicates a motor or drive-system fault. ECL records this code as “Motor Diverter Valve Fault”. Common causes on this page include Faulty diverter motor and Blocked lower sump, 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: Motor Diverter Valve Fault

In simple terms

Whirlpool dishwasher code FB usually means Motor Diverter Valve 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 FB means

The motorised diverter valve that controls water flow between the upper and lower spray arms has failed.

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

  • Faulty diverter motor
  • Blocked lower sump
  • Wiring issue

Safe checks you can make

  1. Check the sump for physical blockages
  2. Requires engineer to replace valve

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 FB 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 FB mean on a Whirlpool dishwasher?

The motorised diverter valve that controls water flow between the upper and lower spray arms has failed.

What usually causes Whirlpool error FB?

Common causes include Faulty diverter motor; Blocked lower sump; Wiring issue.

Can I safely fix FB myself?

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

When should I call a professional for FB?

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

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