Warning: Disconnect power before servicing.
ErrBase

Whirlpool Dishwasher F8 Error Code: Motor Communication Fault

Quick Answer

F8 on a Whirlpool dishwasher is a motor communication fault, distinct from F8 E4 which indicates a full motor circuit fault. F8 alone means the control board is not receiving feedback signals from the motor controller - the motor drive circuitry exists on a separate module on some DTM platform units and communication between them has broken down.

F8 on a Whirlpool dishwasher is a motor communication fault, distinct from F8 E4 which indicates a full motor circuit fault. F8 alone means the control board is not receiving feedback signals from the motor controller - the motor drive circuitry exists on a separate module on some DTM platform units and communication between them has broken down. Start by checking the wiring harness between the motor control module and the main board. A loose connector or corroded pin is the most common cause before the control board itself needs replacing.

WhirlpoolDishwasherSeverity: highDifficulty: intermediate80% DIY Success
Time to Fix
30–80 min
Difficulty
intermediate
Parts Cost
$90 – $280
Tools Needed
Torx T20 screwdriver, Flathead screwdriver

What Does the F8 Code Mean?

The main board lost communication with the motor control circuit. F8 without E4 is a signal-level fault - check the motor control harness connector for corrosion before replacing any boards.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Motor control harness connector loose or corroded40%
Motor control board communication circuit failed24%
Wiring damage between main board and motor controller22%
Main control board communication output failed14%

Symptoms You May Notice

  • F8 displayed without E4 suffix
  • Dishwasher powers on but wash cycle does not start
  • No motor sound at all during cycle
  • Code appears after power surge or voltage event

Can you reset a Whirlpool dishwasher to clear the F8 code?

Unplug for 60 seconds for a full power reset. Soft reset (Cancel/Drain 3 seconds) rarely clears F8 as it is a persistent communication fault rather than a transient sensor event.

Tools Required for Diagnosis

Torx T20 screwdriverFlathead screwdriverMultimeter

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Disconnect power

Disconnect power. Access the motor control module under the tub (near the pump assembly). Locate the multi-pin communication harness connector between the motor module and the main board. Disconnect and reconnect it firmly, inspecting pins for green corrosion or bent contacts.

2

If the connector is fine

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Motor Control BoardW10803728 · $90–$160
Main Control BoardW10695459 · $150–$280

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
BORDERLINE
Estimated Cost: $185 (Parts) vs $700 (New Machine)

Frequently Asked Questions

What is the difference between F8 and F8 E4?
F8 E4 is a full motor circuit hardware fault - the motor failed to run or drew abnormal current. F8 alone is a communication fault - the boards cannot talk to each other about the motor. F8 E4 often means a physical motor or impeller problem; F8 alone is more likely a connector or board-level electronic issue.

Related Whirlpool Dishwasher Error Codes

Code: F8 E4Whirlpool Dishwasher F8 E4 Error Code: Wash Motor FaultCode: E1 F1Whirlpool Dishwasher E1 F1 Error Code: Main Control Board Relay Fault

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience F8 Errors

This repair applies to most Whirlpool dishwashers with this error code. Common model numbers include:

WDT780SAEM, WDF550SAHZ, WDT730PAHZ, WDT750SAHZ, WDT970SAHZ, WDF518SAHM, WDT720PADE

Last verified for technical accuracy on March 14, 2026