CDA fan element not heating BUT element is good

[menderman]

electrofix wrote:the element is a steel tube thats insulated with a powder. this powder can draw moisture out of the air over time

see how it goes

Dave

Thanks for explaining.

[menderman]

NEW UPDATE
I have just noticed that the oven is tripping the RCD but only when. —
The stat temp is set to any temp first and then the selector switch is turned to the grill.
But oddly it only happens if I turn the selector switch in a clock wise direction if I do the same and go to the grill setting but from an anti clockwise direction its ok.
If I turn the selector to the grill first then turn the stat temp then its ok.

But on double checking the combo to post here I could not replicate it at first so I carried on all the way around the dial clock wise to the grill again and it then tripped the RCD once more.
Physically the element looks ok. its a oven grill double combined one – this https://shop.ukwhitegoods.co.uk/062103004-grill-element
Any Ideas

[electrofix]

well try disconnecting each element and see if it trips then

the 2 centre terminals are one element with the outside being the other

all that is going on is one element has probably got an earth fault which wont stop it heating but will blow the safety trip

Dave

[menderman]

Thanks Dave.
The inside element is the grill. Odd that it was ok until I changed the selector switch and odd that it only seems to trip it if I turn the selector switch clockwise.
Could I use my multi meter to check continuity of the element.? But it does not (seem) trip the RCD every time.

[menderman]

Ok had the back off and the outside section of the top element (oven ) rated 1000W has a reading of 51.4 ohms and no continuity on the simple buzzer setting
And the inside section which is the grill part rated 2000W has an ohms reading of 27.2 and does have continuity on the simple meter buz test.
So can I read from this that at 51.4 ohms for a 1000W element – is the oven section and not the grill that has the issue.
There is no continuity (leak) from either elements to earth.

For reference while I was there the other elements read
Ring rated 2500W = 22.2 ohms
small oven grill rated 1450W = 36.9 ohms
small oven – oven rated 700W = 36.6 ohms

[menderman]

Odd that it was tripping when turned to the grill setting but only from clockwise. But looking at the dial when going clockwise the outer oven section comes just before the grill, so going from outer oven to grill – trips but going from grill to oven does not trip.
But it only trips if the stat is first turned to a setting.

[electrofix]

the element might have a slight fault on one side but the contacts of the new switch might connect at slightly different times

also the fault is to earth. we know the elements read ok because they work but you should get no reading to earth. anything less than 2 million ohms is suspect

Dave

[menderman]

Sorry Dave I don’t quite understand.

the element might have a slight fault on one side but the contacts of the new switch might connect at slightly different times

So are you saying that when I turn the selector clock wise with the stat already on then the power hits the fault on its nearest side to the power direction but when I do the same in an anti clockwise direction it hits the fault area last and does not trip the rcd

And

also the fault is to earth. we know the elements read ok because they work but you should get no reading to earth. is suspect

I have no reading to earth on the meter. And yes the two elements work.

anything less than 2 million ohms is suspect

not sure what you mean here.

Could it be that I have wired the selector switch wrong even though I took my time and did one at at time with photos

[electrofix]

to see earth faults the meter has to be on the highest scale and even then on a 9 volt meter it may not show. Proper insulation testers use a minimum of 230 volts but mostly 500V

yes the problem is happening only one way because of the timing of the contacts on the new switch. nothing to worry about if there is no earth problems

Dave

[menderman]

to see earth faults the meter has to be on the highest scale and even then on a 9 volt meter it may not show. Proper insulation testers use a minimum of 230 volts but mostly 500V

I see – thought I was being cleaver and getting my cheapo multi meter out.

Funny that it only started when I changed the switch which made me think I did something wrong there but as you say maybe the element was iffy on the old switch but only showed up as the new switch does things slightly different.
So you are saying – just swap the element.

[electrofix]

does sound like that. if you disconnect the element does tripping stop

Dave

[menderman]

will test that thanks

[menderman]

OK. First tried to get it to trip whilst still connected but wouldn’t trip straight away but after a few times back and forth on the selector and all the way around I got it to trip.
So then disconnected the outer two connections which is the outer run – oven element and back and forth on the selector/ all the way round a few gos but could not get it to trip.
Then re-connected and on the first to and fro would not trip but second time after going all the way around the selector it tripped.

[electrofix]

does sound like it may be the element

it one of those times when you take a chance and replace it

you wont know for certain till you do

Dave

[menderman]

Thanks Dave.
But just thinking about this how can it be the oven element because clockwise the selection gos oven then grill and trips when turning to the grill — so going clockwise from oven to grill I am actually turning the power off to the oven and turning it on for the grill.
But going anti clockwise does not trip – so going from the grill to the oven.
Maybe its time to get a whitegoods person in – would they be able to test the element with popper eqipment.

Next problem is that on here and everywhere else seem to be out of stock, here its says 2-28 days

[Author]

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