Model #WDF780SLYM1 Official Whirlpool undercounter dishwasher

Here are the diagrams and repair parts for Whirlpool WDF780SLYM1 undercounter dishwasher, as well as links to manuals and error code tables, if available.

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Installation guide Owner’s manual

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Symptoms common to all dishwashers

Choose a symptom to see related dishwasher repairs.

April 20, 2023

Why can't I adjust the dishwasher rack height?

By Lyle Weischwill

Main cause: damaged rack height adjuster

April 20, 2023

Why won't my dishwasher fill?

By Lyle Weischwill

Main causes: water supply problem, stuck overfill float, clogged water inlet valve screen, water inlet valve failure

April 20, 2023

Why isn't my dishwasher getting dishes clean?

By Lyle Weischwill

Main causes: improper loading, low water temperature, improper detergent dosage, detergent dispenser failure, spray arm or pump problems

April 20, 2023

Why is my dishwasher leaking?

By Lyle Weischwill

Main causes: damaged or stuck spray arm, leaking door seal, damaged door hinge, leaky heating element water seal, cracked water supply line

April 20, 2023

Why does my dishwasher stop mid-cycle?

By Lyle Weischwill

Main causes: broken door latch, tripped circuit breaker, broken heating element, faulty vent fan, sensor failure, control system problem

April 20, 2023

Why won't my dishwasher start?

By Lyle Weischwill

Main causes: light switch beside the sink turned off, lack of power, bad dishwasher door switch, control system failure, wiring problem

April 20, 2023

Why won't my dishwasher drain?

By Lyle Weischwill

Main causes: clogged kitchen sink drain, clogged drain hose, drain check valve damaged, drain pump failure, control system problem

April 20, 2023

Why does my dishwasher door drop open too fast?

By Lyle Weischwill

Main causes: broken door spring, damaged or broken door hinge

April 20, 2023

Why is my dishwasher noisy?

By Lyle Weischwill

Main causes: glass or popcorn kernel stuck in the chopper blade, drain line vibrating against the cabinet, debris in wash pump or drain pump

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

How to replace a dishwasher door latch assembly

By Lyle Weischwill

If the dishwasher door doesn't click shut, a broken door latch is a likely cause. Follow these instructions to replace it yourself.

Repair difficulty

Time required

30 minutes or less

October 1, 2016

How to replace a dishwasher user interface control

By Lyle Weischwill

The user interface control houses the selection buttons and display. If it fails, you can't select the cycle and settings. Follow these instructions to replace it yourself.

Repair difficulty

Time required

30 minutes or less

April 1, 2014

How to replace a dishwasher thermal fuse

By Lyle Weischwill

A completely dead control panel often indicates that the thermal fuse on the electronic control board is blown; follow these steps to replace a blown thermal fuse in your dishwasher.

Repair difficulty

Time required

15 minutes or less