# How to Fix Maytag Error F51 (Motor RPS Failure)
Error code F51 on a Maytag washing machine almost always points directly to a failure in the machine’s ability to monitor motor speed. This is a critical safety and operational fault that prevents the machine from entering or maintaining the spin cycle.
—
## What Does Error Code F51 Mean?
Error code F51 stands for **Motor RPS Failure**.
The RPS (Rotor Position Sensor) is a critical component mounted near the drive motor. Its job is to act as a digital tachometer, constantly reporting the exact rotational speed and position of the motor shaft back to the Central Control Unit (CCU).
If the CCU does not receive this data, or if the data is intermittent or contradictory, the system assumes there is a critical motor failure and stops operation immediately to prevent damage, displaying F51.
**In plain English:** The washer cannot tell if the motor is spinning, how fast it is spinning, or where it is positioned. The sensor that provides this information needs attention.
—
## Step-by-Step Fix: How to Diagnose and Replace the RPS Sensor
Since the F51 code is highly specific to the RPS sensor, the troubleshooting process focuses on access, inspection, and replacement of this component.
### ⚠️ Safety First
**Before starting any diagnosis or repair, always unplug the Maytag washer from the wall outlet and turn off the water supply.**
### Step 1: Power Cycle the Machine
Sometimes, the CCU receives a temporary glitch, which is incorrectly read as an F51 error.
1. Unplug the washer for 5 to 10 minutes.
2. Plug the washer back in.
3. Attempt to run a short diagnostic cycle (refer to your specific Maytag manual for entering diagnostic mode, or simply try running a Quick Wash cycle).
*If the error clears, the issue was temporary.* If the error returns immediately or during the spin phase, proceed to the physical inspection.
### Step 2: Access the Drive Motor and Sensor
The RPS sensor is typically located on the back of the washer, directly attached to the motor shaft area.
1. **Gain Access:** Depending on your model (top-load or front-load), you may need to tilt the machine back and brace it securely, or remove the rear service panel.
2. **Locate the Sensor:** The sensor is usually a small, rectangular component wired directly to the motor’s outer ring (stator).
### Step 3: Inspect Wiring and Connections
Wiring damage is the second most common cause of F51 errors after the sensor itself fails. Vibrations from repeated cycles can loosen plugs.
1. **Check the Motor Harness:** Carefully inspect the electrical harness leading away from the RPS sensor. Ensure the connector plug is seated tightly into both the sensor and the main wiring loom.
2. **Look for Damage:** Inspect the wires for fraying, pinching, or signs of water damage or corrosion, especially near the connections. If you find damaged wiring, repair or replace the harness section.
3. **Check the Motor Rotor:** While you have access, ensure the large magnet rotor (the central piece that spins) is clean and free of metal debris, which could interfere with the sensor’s magnetic readings.
### Step 4: Test and Replace the Rotor Position Sensor (RPS)
If the wiring is secure and looks undamaged, the sensor itself has failed internally and must be replaced.
**Note:** Replacing the RPS sensor requires removing the large bolt holding the motor rotor onto the shaft. This procedure is generally straightforward but requires a wrench and careful handling.
1. **Remove the Rotor Bolt:** Use a socket wrench to remove the central bolt holding the rotor in place.
2. **Remove the Rotor:** Carefully pull the magnetized rotor off the shaft.
3. **Access the Stator:** The RPS sensor is mounted on the stationary ring, called the stator.
4. **Replace the Sensor:** Disconnect the electrical connector and unclip/unscrew the old sensor. Install the new RPS sensor exactly where the old one was mounted.
5. **Reassemble:** Reinstall the rotor onto the shaft, securing it tightly with the central bolt.
6. **Test:** Restore power to the machine and run a test cycle. The F51 error should be cleared.
—
## Need a Replacement Part?
If you have confirmed that the RPS sensor is the culprit, replacement is the necessary solution.
Check the price for a replacement Rotor Position Sensor here: https://www.amazon.com/s?k=Maytag+Rotor+Position+Sensor&tag=trivian-20