Miele Professional Laboratory Equipment
Replaced ntc for water and water check but still remains error code f21.
The error code remains f21 even after changed the ntc.
It would appear that another person had an "F21" error with a Miele G 7883 washer (http://www.medwrench.com/?community.posts/threadNo/12879/subject/Miele-G7883-CD/).
It has been suggested that you should call Miele's tech support directly at the information below:
Service Enquiries (01235) 554466
Monday - Friday 08:00 - 18:00
Saturday 09:00 - 12:00 (to book service calls only)
Link to other countries
Hope this helps,