Fisher & Paykel Module MC AquaSmart PH 7 120V service replacement; washer electronic control module/board 420579USP

Electronic control module for Fisher & Paykel AquaSmart washers. The module manages washer functions such as filling, washing, draining, spinning, drive motor, drain motor, and water valves. The original part 420579USP is documented as replaced by Fisher & Paykel part 421226USP.

Is This the Right Part?

Common Symptoms

• Washer does not start or respond to control inputs
• Washer fails to fill, wash, drain, or spin
• Drive motor, drain motor, or water-valve operation may be absent or abnormal
• Control buttons may flash while the washer remains inoperative

Check Before Replacing

• Confirm the washer has power and that its circuit breaker or fuse has not tripped.
• Check whether the control panel responds consistently to normal button presses.
• Observe and record any displayed fault code before attempting service.
• Verify that water supply valves are open and that drain restrictions are not present before attributing a filling or draining problem to the module.
• Compare the installed module's part number and connector layout with the replacement part before installation; do not force connectors.

Pro Tip

Part Details

Key Features

• Fisher & Paykel genuine OEM washer control module
• 120V service replacement
• AquaSmart washer module
• Controls multiple washer functions and connected loads
• Original part 420579USP is replaced by Fisher & Paykel part 421226USP

Installation Notes

• Disconnect electrical power before servicing or installing the module.
• Use the appliance-specific service or installation documentation and follow its connector and configuration instructions.
• Confirm the replacement module is the correct version for the washer before connecting it.
• Handle the electronic board carefully and avoid contact with circuitry unless required by the service procedure.
• If diagnosis involves live voltage testing or configuration beyond normal connector replacement, use a qualified appliance technician.

Verified Compatible Models

WL37T26DW1-96125A, WL42T26DW1-96178A, WL37T26CW2-96109A, WL37T26DW2-96113A, WL42T26KW1-96174A, WL26CW1-96215B, WL42T26CW1-96176B, WL26CW2-96114A, WL42T26CW1-96176A, WL42T26DW1-96178B, WL37T26KW2-96104A, WL26CW1-96215A

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.