Fisher & Paykel Washers 21 Error: Hall sensor fault
Fisher & Paykel washer error code 21 is a high-severity fault meaning Hall sensor fault — rotor position sensor failure. Running a SmartDrive with a hall sensor fault risks uncontrolled motor commutation, which can overheat the stator windings or damage the motor controller.
~20%
DIY Fixable
From $200
Typical Repair Cost
2–5 hrs
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Running a SmartDrive with a hall sensor fault risks uncontrolled motor commutation, which can overheat the stator windings or damage the motor controller. Do not run spin cycles until the fault is resolved.
Can I reset the code?
Yes. Power-cycling clears the fault code, but if the hall sensor has physically failed the code will return as soon as the motor attempts to spin. A cleared code is not a repair.
When to stop immediately?
Stop if you notice: Any burning smell during spin ramp-up, Basket makes grinding or scraping sounds.
Symptoms You May Notice
Code 21 flashes during spin ramp-up
The fault appears as the SmartDrive tries to accelerate the basket — the controller cannot confirm rotor position and halts.
Erratic basket movement
The basket may twitch or jerk rather than spin smoothly, as the motor controller loses position feedback and cannot commutate correctly.
Wash cycles complete but spin fails
Fill and agitate stages run normally because they use lower motor speeds where the hall sensor fault has less effect, but spin ramp-up fails.
Possible Causes
Failed hall effect sensor
One or more of the three hall sensors mounted in the SmartDrive stator assembly has failed, preventing accurate rotor position feedback to the motor controller.
Requires ProfessionalDamaged hall sensor wiring
The small-gauge wiring from the hall sensor array to the motor controller has been chafed or pinched inside the machine base.
DIY PossibleContamination on rotor magnets
Metallic debris or lint accumulation on the rotor's permanent magnets is causing erratic hall sensor readings.
DIY PossibleSafe Checks You Can Do
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1
Power-cycle & observe spin behaviour
Unplug for 5 minutes, restore power, and run a spin-only cycle while listening for any unusual motor sounds during ramp-up.
A healthy SmartDrive accelerates smoothly. Jerking or buzzing during spin acceleration confirms a position-sensing problem.
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2
Inspect hall sensor harness
After unplugging, access the machine base and trace the thin hall sensor harness from the stator to the motor controller. Look for chafed insulation, sharp bends, or loose connectors.
The hall sensor wires are thin — typically 24 AWG — and more vulnerable to abrasion than the main motor windings harness.
Tools required
When to Call a Professional
Contact a qualified technician if:
- Hall sensor replacement requires disassembling the SmartDrive stator, which involves removing the wash basket and rotor
- Individual hall sensors must be sourced as a matched stator assembly on most SmartDrive variants
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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