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Potterton Netaheat - knob keeps rotating?

I have a Potterton Netaheat 16-22 MKIIF, and the front knob rotates, but does not stop at the off, and max.
Is it possible the grip on the knob is worn out?
Tiger, October 2010
link Click here to see other fixes for Potterton 16-22 MKIIF.