Hi I'm Josh from eSpares. And in this video
I'll be helping you to diagnose a fault in your electric hob.
Electric hobs come in three different types
an element a ceramic and induction.
here I've got two of those types element and ceramic and although
they look
quite different essentially they work in the same way.
I'm just going to take the top of the ceramic hob
just to give you an idea of what's going on inside.
And now an element is quite simple it's essentially
a resistive wire which has current
passed through it and the resistance causes it to get hot
which is obviously what cooks the food. Now here I've got
the four rings inside the ceramic hob.
These two rings contain two elements
and these two both have a single element.
Now the way that the temperature is controlled in these rings
is through the control board. And the control board
cycles these elements on and
of and that produces a average temperature.
Now if you find on your ceramic hob
that when you turn your ring on
it is going on full blast and it's not actually having its temperature
regulated.
This is very likely that there is an issue with the control board
and you need to replace it. Now if one of the areas on the ring
isn't heating up and you can actually examine the wire for any breakages
or damage and you can also test the element
by using a multimeter on a resistance setting setting
So if I just test the outer element. I'm looking for a reading of less than a
hundred ohms for a working element. Here
I'm getting a reading of about thirty eight ohms
and on the inner element about seventy two ohms so that shows that
both those elements are working okay.
Now it may be that your hob doesn't use
a control board it actually uses a variable
switch to cycle the power on and off. So
if you're hob does have that type of switch and you're turning it to a
particular position
but the element is coming on full blast. Then the chances are that the switch
is faulty and you need to
replace it. If we move over onto the
element hob here. This type a hob can also use
a variable switch to cycle the power
on and off on a ring.. And again if you are finding that
when you turn the switch on the element is just going on full blast
and you should replace the switch. This particular hob
actually uses a six position switch to control
each ring. Now the fact that it's got six positions
means that each ring is going to contain 3 elements.
And the position that you set the switch at will determine how many of those
elements are turned on to produce the relevant
heat. I'f you're finding that when you turn it on it's not
reaching the right temperature, you can test
the element. Here I've got
one to show you, and again using your multimeter.
And I'm just looking for any reading is between 15 300
ohms across those elements so any reading outside of that range
would indicate the presence of a fault and the ring will need to be replaced.
Another fault that you may have on your hob is that it's simply not
receiving
any power at all For that you need to check
the terminal block inside the hob where the power cable comes in.
Have a look for any signs a burning or damage to the wires.
Obviously if you do see anything wrong with it you will need
to fix it or replace it. Now a word
about induction hobs, these work slightly differently
to these two types of hob and they use
electromagnetic coils. Now
the electromagnetic coils actually
only heat any ferrous metal. So as a
pan is placed on, the pan is heated directly through
electromagnetic induction and for that reason if you place your hand on it
and you won't feel any heat. Now because they do work quite differently and are
more complicated it can be difficult to diagnose
and fix an induction hob. And for that reason you may prefer
to use a fixed price repairs service such as Repair Care.
Now if you need help diagnosing other appliances check out our other
eSpares videos. And spare for hobs and other appliances
are available on the eSpares website. Thanks for watching.