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Error message E1 on Waterside MC250?

I have a water softner that I restarted after a lapse of over a year. After mending a leaking problem I finally manage to get it started. Unfortunately now I get an error message E1 on the display. I am unable to find the definition and solution of this error. Can any body tell me what is this error and how to get rid of it.
vinman, March 2009
Rotary valve seized or motor failure, call BWT for parts or an engineer

DJL, November 2011
link Click here to see other fixes for Waterside MC250.