New oven tripping rcd

[samgoffe]

A new oven has been installed, but when ever the wall socket is switched on it trips the rcd, but not the oven one. The oven remains on, the if I turn the fan oven on, it goes off, turn the oven back off and the clock displays again.

The oven has its own trip, but remains on all the time.

What could cause this? Nothing else trips the circuit.

 

[EFLImpudence]

Did the installers not test it?

 

[Taylortwocities]

Is the oven connected to an existing, working circuit. Or was a new one provided when the oven was "installed"?

 

[samgoffe]

It's an existing circuit, but no oven has been connected to it since the rewording was done.

The oven wall switch also has a plug on it , if we use anything in this switch, it trips the oven circuit, not the other rcd. Strange.

 

[AndyPRK]

Your description isn't very easy to understand.

Does your Consumer Unit have 2 RCD's in ?

Maybe the oven neutral wire is fitted to the wrong neutral bar inside the CU.

 

[samgoffe]

Sorry, not the best with this stuff.

Here is the consumer board. With the oven connected, turning the wall switch on trips the right trip labelled "RCD controlled circuits", but the one labelled "cooker" stays on.

In this scenario, if I then turn the oven on to warm up, the oven dials fade off, then turn the oven temp off and the dials come back.

We have a cooker and plug wall plate, both switched, like so.

View media item 80356 View media item 80357

 

[AndyPRK]

Was it a second hand cooker?

So if you leave the red cooker switched off, and plug something (e.g a kettle) into the cooker socket and turn it on, (and turn the kettle on) the RCD will trip ?

Tell us the answer before continuing.


If you feel confident and safe, turn off the red main switch on the consumer unit (bare in mind the terminals/wires on the main switch are still live, so don't touch anything.

Remove the front cover and take a decent photo with flash on.

We are interested in the bars at the top with the black & blue wires. Are there 2 or 3 ?

We are also interested in the whole CU wiring

 

[ban-all-sheds]

We are also interested in the whole CU wiring

Indeed we are, because from the front it doesn't look as if the cooker circuit is on either RCD.

 

[EFLImpudence]

It's an RCBO.

Waiting to see where the fly lead goes.

 

[ban-all-sheds]

It's an RCBO.

So it is.

 

[samgoffe]

Brand new cooker.

Yes, if I use the plug, it trips, even with the cooker off.

I'll take a good photo of the wiring for the CU later on. My other halfs electrician reckons it could be as simple as the wall plate, but I doubt she explained the CU setup to him!

Is it worth bypassing the wall switch using a choc-box for a test?

 

[First-time-buyer]

Have you used this socket before the oven was fitted?

As mentioned above, we suspect the RCBO white lead is in the wrong neutral bar.

Who fitted the Cooker MCB?

If the socket has never been used, and is tripping now, then its an electrician warranty claim.. free of charge

 

[ekmdgrf]

Is it worth bypassing the wall switch using a choc-box for a test?

Probably not at this stage.

Is it your Consumer Unit that needs a jolly good dose of IPA or your camera lens?

 

[samgoffe]

We moved in a few weeks ago, and the plug hasn't worked since. The house was re-wired only 6-8 months ago and has never had an oven in it.

No idea who the electrician was, not overly bothered above a warranty claim, just want a hot dinner!

The photos above are my iPhone, believe it or not, and there is dust and scratches all over the lens. I'll get the SLR out later for a gooden.

 

[EFLImpudence]

As mentioned above, we suspect the RCBO white lead is in the wrong neutral bar.

I did mean the neutral lead but I suppose that is a possibility too.