Ring turns on and off without turning the nob?

Possibly a failing switch

http://www.buyspares.co.uk/cooker-oven/ec600dodlm-058552065/energy-regulator-simmerstat/catalogue.pl?shop=stoves&path=110835&model_ref=1014532&refine=energy%20regulator%20%28simmerstat%29

Check you are ordering the correct part

Make sure you know how to change the part

Make sure you are competent to do so.

XXX
June 2016