How to Fix a Whirlpool Cabrio / Maytag Bravo / Kenmore Oasis Washer with both an F50 & F51 Error Codes
Both are RPS sensor errors...
You'll prolly need to update the sensor, harness and control.
Sensor and harness ==> http://www.repaircli...0183157/1394136
Control ==> http://www.repaircli...0189966/1469076
Also check for clothes or foreign objects stuck in between the inner wash basket and the outer tub and for a loose bolt on the rotor at the bottom of the machine.
RPS= Rotor Position Sensor
Source: wp cabrio wtw6600sw