David: Try downloading this free user manual: http://laundry.manualsonline.com/manuals/mfg/miele/pw_6065.htmlk According to ApplianceHelponline.: "
Heater pressure switch
The program is interrupted and the drain pump is operated. The display shows Technical fault F51. Call Service Department. The buzzer is activated for 2 minutes.
Background information:
Start position: One second after the program start, heater relay K1/1 is activated. This enables a check as to whether the contacts on heater pressure switch B1/13 have closed on switching steps 21/22 or 11/12.
Cause:
Heater relay defective; contact open.
Remedy:
Replace the heater relay.
Cause:
Heater relay solenoid defective.
Remedy:
Replace the heater relay.
Cause:
Connection from heater relay to electronic module open-circuited.
Remedy:
1. Check plug connections.
2. Check the connection wires for continuity.
Cause:
Heater pressure switch open- or short-circuited.
Remedy:
Replace the heater pressure switch.
Cause:
Connection from heater pressure switch to electronic open-circuited.
Remedy:
1. Check plug connections.
2. Check the connection wires for continuity.
Cause:
Foreign objects in heater pressure switch.
Remedy:
Replace the heater pressure switch."
SOURCE: Whirlpool Cabrio HE washing machine
I work for an appliance repair company and I had a recent service call for the same exact situation on this washer. I also know that Rotary Position Sensor is linked to the F-51 error code. I have found that this is not always the case. On this paticular call the F-51 error code was caused by a piece of clothing (sock, wash cloth, etc.) being stuck or jammed between the internal basket and the outer tub. I removed the cloth and the washer ran fine, so give that a check first before you spend the money.
SOURCE: Whirlpool washing machine - F51 code
F51 - This is a motor Rotation Positioning Sensor failure. If this persists you will eventually need to call in a service engineer to repair it as the machine will eventually stop working altogether.
SOURCE: In mid wash the Kenmore Elite Oasis HE flashes F51 and
check if basket turns freely. if it does replace the main board
SOURCE: whirlpool cabrio washer showing F51 error code
Hi Craig,
Just saw this post come up among F51 error codes (as it will show previously posted and answered questions ) and wanted to add some info I have regarding this exact issue you may or may not already have, no harm in posting either way.
The F51 typically indicates a failed "RPS" has been detecected...but it can be the result of other issues...just for future reference and if anyone has not come accross this before.
The scenario you describe is usually associated with a item stuck under the tub or a loose stator or a faulty "RPS" device or connection at the "RPS"...but I don't know if you checked that yet or if you know how, thus the error F51.
**The repair tip below is directly from Whirlpool**
F51 is usually associated with the rotor and stator/RPS assembly and quiet often it is initiated due to a loose rotor or bad RPS...I'd start by checking the bolt.
There is a repair tip regarding this which suggest checking the wires to the RPS and then the rotor, while insuring the center bolt is really tight via applying some "lock tight".
I actually see a lot of these and most times it's a loose rotor bolt, that is where I always start my diagnosis. Here's an exert from my files directly from Whirlpool...
You may want to check the rotor, I've seen the center bolt become extremely loose, thus causing the F51 error, this is where and what to look for shown below... 
...but either way that should help out with the repairs and good luck.
Regards,
Macmarkus :)
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