Only half my new electric hob is working

adougl16

Attached is picture of wiring for my new electric hob. 

The heat elements on the left are working perfectly, however the ones on the right do not do anything. I can switch them on and use the controls to turn them up and down, but no heat comes out of either of them.

Is this a faulty hob or a problem with how it is installed?

edit: as mentioned, I am aware the earth is not wired in correctly, but it was inserted correctly when the hob was switched on, before this photo was taken

Section62

adougl16 said:

Attached is picture of wiring for my new electric hob. 

The heat elements on the left are working perfectly, however the ones on the right do not do anything. I can switch them on and use the controls to turn them up and down, but no heat comes out of either of them.

Is this a faulty hob or a problem with how it is installed?

Edit:  The image in the original post has been changed since these comments were posted.

Is the second terminal on the copper bridge done up tightly (the one numbered '3' on the diagram)?

As an aside, it would be better for the neutral wire to be a bit shorter - it looks like you will have trouble closing the cover and there is a risk of the neutral wire being trapped and damaged against the 'live' terminals.

macman

These usually have 2 separate heating assemblies, left and right, so i suspect the r/h side is faulty.
The wiring options shown are usually for 3 phase supplies, which we don't use in residential properties in the UK. If it's wired correctly for a single phase supply, then the unit is faulty and your remedy is with the supplier.
Who installed it?

grumbler

One of the wiring options shown IS for a normal 1-phase supply and the hob IS WAS wired correctly.

Most likely, as Section62 said, something is wrong with the copper bridge, and the top left screw doesn't look good.

Also, I don't see in the photo how the earth wire is connected, especially as the actual layout differs slightly from the on the sticker. However, this shouldn't affect  the functionality.

Section62

macman said:

The wiring options shown are usually for 3 phase supplies, which we don't use in residential properties in the UK.

Looking at the diagrams it appears they are suggesting either -

(Left) use of 5-core 1.5mm2, with terminals 2 and 3 on (presumably) different phases (415v) and parallel neutral conductors

(Centre) use of 5-core 1.5mm2, with terminals 2 and 3 on one phase via pairs of parallel phase and neutral conductors

(Right) use of 3-core 2.5mm2, with terminals 2 and 3 on one phase, using the copper bridge to link 2 and 3


Presumably this is because the load from the whole hob is too great for one 1.5mm2 conductor.

But they have done a fantastic job with the diagrams and colours to confuse the heck out of someone working with old UK cable.  I wonder whether this is actually manufactured for retail sale?

If the control panel is powered via terminal 2, and terminal 3 isn't getting power because the bridge isn't installed correctly, that could be a cause of the observed symptoms (the controls work, but no heat)... but only my guess.

If tightening/checking terminal 3 didn't work then it is an electrician job, or contacting the manufacturer as a suspected faulty appliance.

grumbler

Section62 said:

macman said:

The wiring options shown are usually for 3 phase supplies, which we don't use in residential properties in the UK.

But they have done a fantastic job with the diagrams and colours to confuse the heck out of someone working with old UK cable. 

Well, would it be better if they just shown N and L, without colours? And it's really worth replacing some old short  piece of wire connecting the hob the cooker plate.

BTW, the insulation of the black wire is damaged.

greyteam1959

Yes I would be concerned about the obvious damage to the insulation on the black wire.

Ectophile

It looks like a pan-European design.  In many parts of Europe, three-phase supplies are common.  The hob has been designed to run half the elements off one phase, and half off another.

In the UK, three phase supplies are rare in houses.  So the right-hand diagram applies.  The copper bridge is used to link the two halves of the hob to a single live wire.

As others have said, check the copper bridge is properly installed, and the screws tightened up.

That neutral is horrid.  It's too long, and someone has mangled the insulation on it.  To make things worse, it's mangled, just where it passes over one of the live terminals.

fenwick458

who's had a go at wiring that up? looks like you won't be able to shut the lid the N is too long and is the earth even connected?

adougl16

It was bought in the UK, so I am at a loss why it is a "pan European design"

coffeehound

The cable clamp looks too weak to hold the heavy T+E cable too.  Could do with something else to stop it twisting each time the hob is moved