Whirlpool Cabrio Error Code F51: How to Fix It

The Logic Verdict

My Take: The video author notes: “F51 has to do with the motor precision sensor… but in this case… we find that this nut that’s supposed to be on the shaft was loose.” Based on this, I recommend inspecting the Rotor Mounting Nut first, then the Rotor Position Sensor (RPS).

What It Means

The F51 code indicates a Rotor Position Sensor (RPS) Failure. The main control board is not receiving a signal from the motor sensor, meaning it can’t tell if the drum is spinning.

Common Causes

1. Loose Rotor Nut: The nut holding the rotor (motor) to the shaft has vibrated loose, causing the rotor to wobble or disengage.
2. Faulty RPS Sensor: The sensor itself has failed.
3. Obstruction: Clothing stuck between the inner and outer tubs preventing rotation.
4. Wiring Issues: Corroded connections at the sensor.

Step-by-Step Fix

1. Check for Obstructions:
   • Spin the tub by hand. If it spins freely, the issue is likely the rotor or sensor.
   • If it’s hard to spin, check for clothes stuck between the tubs.
2. Access the Motor:
   • Safety: Unplug the washer and turn off the water.
   • Tip Back: Carefully lean the washer back against a wall or have a helper hold it.
   • Remove Guard: Remove the plastic shield covering the motor assembly at the bottom.
3. Inspect the Rotor Nut:
   • Check the center nut on the large rotor (the part with magnets).
   • If it is loose or has fallen off, tighten it back onto the shaft.
   • Tip: Use a thread locker (like Loctite) or a bit of silicone on the threads to prevent it from coming loose again.
   • Hold the rotor/drum still with vice grips or a helper while tightening.
4. Replace RPS Sensor (If Nut is Tight):
   • If the nut was tight, the RPS sensor is likely bad.
   • Remove the rotor bolt and pull the rotor off.
   • Unclip and replace the white sensor board located on the stator.

Resources

• Whirlpool Cabrio Rotor Position Sensor (Amazon)
• Threadlocker (Loctite) (Amazon)