Neff Induction Hob

[AKS]

I have a Neff T42D29X/01 induction hob. Recently there have been intermittent occasions when the RCD in the breaker box has tripped but I have been unable to isolate the problem. Now the RCD has tripped and I have been unable to re-set it. I have isolated the problem to the circuit that only has the hob and oven which are connected directly to an MCB, but this does not trip. The problem appears to be with the hob, if I remove the earth lead from the circuit the power stays on but the RCD trips as soon as the earth lead is re-connected. Any suggestions.

[electrofix]

where did you remove the earth cable from ?

you need to isolate the oven or the hob to be certain which one it is

you need to be aware that when you disconnect the earth cable anything on that circuit will then give you an electric shock

Dave

[AKS]

There is a junction box inside the cupboard of the hob housing and I removed it from there. With the hob disconnected from the circuit and the ocen still connected the RCD does not trip.

[electrofix]

well if its the hob you would need to strip it and find out which components have the earth leak

Dave

[AKS]

I have totally disconnected the hob from the circuit and only the oven is now connected.

[AKS]

I have opened it up but I would need a circuit diagram to be able to identify the possible culprit.

[electrofix]

no circuit diagrams. I cant get them , Neff only allow their own service engineers to access

all you need is a multimeter. the terminal block connect to various boards. take a clear photo and disconnect all the wires and use a multimeter to see if any of the wires have an earth fault. also carefully check the connection block

Dave

[AKS]

I didn’t want to totally dismantle the unit until I had any suggestions as to the problem. I have removed the ceramic top and I can see a control board and a power supply board under two of the heating elements. I will have to delve deeper and as you suggest check every connector. I have a suspicion that the fault is most likely with the power supply, but I will check all and post my findings.
Thanks.

[electrofix]

its not like a normal hob and nothing really get hot so earth fault should be rare. I was thinking one of the suppressor capacitors on the board as these often bridge from live to earth

Dave

[AKS]

It is not unusual to have leaking capacitors. I will take the board out and check.

[Author]

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