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PostPosted: Mon May 08, 2017 11:32 am 
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So the range cooker in our new house is tripping the RCD.

Left to its own devices in standby, just clock on, it doesn't trip the RCD.
If we try to use the grill, that works fine - doesn't trip the RCD.
If we try to use the fan oven, that does nothing (fan doesn't spin) but doesn't trip the RCD
If we try to use the electric oven (there is another oven without a fan) that immediately trips the RCD

Any tips? I don't know how to assess whether to two elements and a fan motor have gone or whether it's just one of those components shot.

Thanks!!


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PostPosted: Mon May 08, 2017 11:37 am 
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Sounds like one of the elements has a fault. Dismantling is usually straight forward but Googling the make/model and looking at the spares will give an insight into how they are fitted - therefore how to remove!

If there is more than one element consider changing both as a precautionary measure.

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PostPosted: Mon May 08, 2017 11:45 am 
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kellys_eye wrote:
Sounds like one of the elements has a fault.


I'd come to the same conclusion - but I'd hoped there might have been a way of knowing which element and/or motor!

Oh well.

Thanks anyway! :-)


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PostPosted: Mon May 08, 2017 12:04 pm 
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There is, but you need an insulation resistance tester to find out, and they are not cheap.

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PostPosted: Mon May 08, 2017 12:26 pm 
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someone-else wrote:
There is, but you need an insulation resistance tester to find out, and they are not cheap.


hmmm...I have a Fluke TPWS multimeter - are we just after a continuity test? If so I can do that relatively painlessly?

What about the fan motor - is there a way to test that?

Thanks for the help!


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PostPosted: Mon May 08, 2017 12:33 pm 
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Not really. :cb
An insulation resisatnce tester uses 500v or 1000v to test, the idea being that the high voltage can "jump" across any where that the insulation is breaking down, this is then shown on a read out (in ohms)

You can try the fan though.

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PostPosted: Mon May 08, 2017 6:09 pm 
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someone-else wrote:
There is, but you need an insulation resistance tester to find out, and they are not cheap.


Or just disconnect the element from the mains (usually a spade connector), isolate the connector, turn the oven on and see if the RCD trips? If the RCD does not trip then it is almost certainly the element.

The last few oven elements I have swapped did not need an insulation resistance tester. You could see that they had blown when I removed the cover.


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PostPosted: Mon May 08, 2017 6:14 pm 
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dan_ce wrote:
If we try to use the fan oven, that does nothing (fan doesn't spin) but doesn't trip the RCD


I'm taking this bit of your post as a separate fault to the other oven

So either both the fan and element have failed or they are not getting any power from the switch. You need to check for a voltage at both the fan and element when switched on.


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PostPosted: Mon May 08, 2017 6:32 pm 
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:dunno: I'm no expert but the lack of fan and the tripping would suggest an issue with thermostat and/or the control switch on that side of the oven.

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PostPosted: Mon May 08, 2017 7:38 pm 
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wine~o wrote:
:dunno: I'm no expert but the lack of fan and the tripping would suggest an issue with thermostat and/or the control switch on that side of the oven.


I think that there are two separate problems.

If I have got this correct then the OP has a double oven. One is a fan oven that gives off no heat, the fan does not work and the RCD does not trip.

The other oven (the non assisted one) trips the RCD.

With a fan assisted oven the fan is normally running as soon as the switch to the oven is turned on and should run all the time, regardless or not of if the thermostat calling for heat.


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PostPosted: Mon May 08, 2017 8:40 pm 
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'New house' ??

New equipment? Warranty issue maybe?

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PostPosted: Tue May 09, 2017 12:20 am 
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Many elements are mineral insulated which is hygroscopic, the end seal should stop water ingress, but long storage can mean water gets in. In the main we only switch the line, so because the neutral is still connected a faulty element can cause a RCD to trip when there is a high load from another source, so a fault on the fan over element could cause the RCD to trip when the other oven is used, trying to unplug the neutrals as well as lines and put the terminals safe to test is a very slow process to do in a safe manor.

If you are lucky and you can see a fault great, but if not then likely better to bite the bullet and either get some one with an insulation tester to test it for you, or buy or hire a tester. Quick hunt and a tester costs around £100 seems a lot of money for one job.


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