In message , The Medway Handyman
writes
raden wrote:
In message , The Medway
Handyman writes
Phil L wrote:
The Medway Handyman wrote:
Hi

I need to check a 3kw x 27" immersion heater element to see if it's
working. If I connect my multi meter across the terminals, what
resistance should I find?

Why bother? - sling it in the skip and fit a new one which will cost
about £20 - the customer will be happier and you won't be back
there working for free every weekend trying to get it to work.

It's one I fitted about 6 months ago. Got it from Toolstation. I
suspect it's the timer at fault because he has hot water OK in the
mornings, but not later on in the day.

I need to isolate the problem.

So shouldn't you check that the element is actually getting volts when
the timer claims to be on ?

I will indeed, but if it is getting volts it isn't necessarily heating the
water. Or is it?

Just that I don't want to change the element and not sort the problem.


If you have 240 volts across the element (at the element) then yes, it
will either heat up or it's buggered

It's either open circuit or it has a finite resistance which will
generate heat when a current is passed through it

there are no other possibilities other than in DrivelPhysics

--
geoff