Just dismantled my DD DTi 600V which lost 2 rings right out of warranty.
Turns out DD designed thin traces on neutral lines on the circuit board which are 100% bound to fail over time,knocking out at least 2 rings if not all control circuit,depending which of 2 neutral lines fail.
Looks like they could be bridged to effect a repair,not bothered with mine cos the wife wanted good old fashioned hob
djx, January 2017
