Model #FDB421RFR6 Frigidaire dishwasher

Here are the repair parts and diagrams for your Frigidaire FDB421RFR6 dishwasher. 

The diagram(s) below can help you find the right part.  If you’d like help, we invite you to call our customer service number at the top of the page, or click chat.

On this page, you can also find any manuals, installation guides and error code tables associated with this model.

For advice on diagnosing problems with appliances, lawn & garden equipment and other products, check out the videos, repair guides and articles in our DIY section.

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Showing 10 of 105 parts

Dishwasher Pump O-Ring, Front


Motor & pump Diagram

31% OFFMSRP:$38.00

In Stock

Dishwasher Rinse-Aid Dispenser Cap


Door Diagram


In Stock

Dishwasher Door Spring


Door Diagram

Dishwasher door spring

Part #154325201
29% OFFMSRP:$26.00

In Stock

Dishwasher Thermostat


Tub Diagram

Dishwasher thermostat

Part #154290204
20% OFFMSRP:$42.00

In Stock

Dishwasher Water Feed Tube Gasket


Motor & pump Diagram

15% OFFMSRP:$45.00

In Stock

Dishwasher Dishrack Slide Rail Stop


Racks Diagram

35% OFFMSRP:$27.00

In Stock

Dishwasher Heating Element Terminal Shield


Motor & pump Diagram

Dishwasher heating element terminal shield

Part #154289801
This item is not returnable
8% OFFMSRP:$5.00

In Stock

Dishwasher Sump Gasket


Motor & pump Diagram

Dishwasher sump gasket

Part #154246801
17% OFFMSRP:$88.00

In Stock

Dishwasher Dishrack Track Roller Screw and Washer


Tub Diagram

8% OFFMSRP:$11.00

In Stock

Symptoms common to all dishwashers

Choose a symptom to see related dishwasher repairs.

Main cause: damaged rack height adjuster
Main causes: broken door spring, detergent dispenser failure, cabinet mounting brackets loose or broken
Main causes: damaged or stuck spray arm, leaking door seal, damaged door hinge, leaky heating element water seal, cracked water supply line
Main causes: light switch beside the sink turned off, lack of power, bad dishwasher door switch, control system failure, wiring problem
Main causes: water supply problem, stuck overfill float, clogged water inlet valve screen, water inlet valve failure
Main causes: clogged kitchen sink drain, clogged drain hose, drain check valve damaged, drain pump failure, control system problem
Main causes: broken door latch, tripped circuit breaker, broken heating element, faulty vent fan, sensor failure, control system problem
Main causes: glass or popcorn kernel stuck in the chopper blade, drain line vibrating against the cabinet, debris in wash pump or drain pump
Main causes: improper loading, low water temperature, improper detergent dosage, detergent dispenser failure, spray arm or pump problems

Repair guides common to all dishwashers

These step-by-step repair guides will help you safely fix what’s broken on your dishwasher.

October 1, 2016
By Lyle Weischwill
How to replace a dishwasher vent and fan assembly

If the control panel goes blank, the fan could be to blame. Replace the vent and fan assembly using these steps.

Repair difficulty
Time required
 30 minutes or less
How to replace a dishwasher circulation pump and motor assembly

When the spray arm won’t spray, you might need to replace the circulation pump and motor assembly. Here's how.

Repair difficulty
Time required
 30 minutes or less
October 1, 2016
By Lyle Weischwill
How to replace a dishwasher water inlet valve

If your dishwasher fills constantly or won't fill at all, the water inlet valve has failed. You can replace it in about half an hour.

Repair difficulty
Time required
 30 minutes or less

Articles and videos common to all dishwashers

Use the advice and tips in these articles and videos to get the most out of your dishwasher.

June 19, 2019

How to load a dishwasher video

By Sears PartsDirect staff

Find out where dishes should go, as well as what never to put in a dishwasher.

September 29, 2016

Dishwasher detergent cup not opening video

By Sears PartsDirect staff

Overloading the detergent dispenser, using clumpy soap and a broken actuator are reasons why the dispenser won't open.

January 16, 2015

How to fix rust spots on a dishwasher dishrack video

By Sears PartsDirect staff

It’s easy to get a newer looking dishrack!