Please compare your old part with the photographs and dimensions provided prior to ordering as manufacturers change the design and components of their appliances without changing the model numbers and this is beyond our control.
Usefull tip!
To reset the F21 error on a Siemens machine, turn the program knob from the off position (12 o'clock) to the 6 o'clock position and immediately press and hold the spin button. Then while holding the spin button turn the knob to 7 o'clock position and continue holding the spin button for 15 seconds. Then turn the knob to the off position.
You may need to try this a few times!