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Note there are a fair number of units in this series I may be able to find more info for you but need the complete Model Number.

I am assuming you unplugged the unit or threw the breaker for a while and it made no difference.

If the element/s are on full then odds are high that the Electronic Control is shot (either the electronics are holding a relay closed or more likely the relay's contacts are welded together.

Unfortunately it looks like many of the control boards for this series are obsolete.

If the element is just half on there is a possibility that a wire has shorted to the frame.