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Can I mend or renew the heat controller knob?

MY neff HALOGEN hob 7 inch ring heat controller knob
works only on/off. On is on maximum heat only.
G LAWTON, February 2014
If it stays on full heat all the time the switch is faulty and yes you can replace the switch.( it is called an energy regulator)

Kenjo, February 2014
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