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HIi guys,

Had a call out to a property today and looking for a bit of advice. As stated the RCD trips whenever the immersion heater kicks in.

I have disconnected the incoming cables and Insulation Resistance tested them and they come out >200MOhms which is all good.

The element is a Theeta WT7 and the RCD trips whenever this reaches set temperature.

When i disconnect the earth from the immersion it holds and when I link through the element it holds. It's only when I introduce an earth that the RCD trips.

Am I missing something really obvious? Or is there something I've failed to do? I hoped it'd just be the element but the problem occurs when it's been linked through which is bugging me.

I want to be able to say I've taken it as far as possible until the plumber is back from faking sickness!!

I've tried to attach some pics of the issue.
 

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Gasp, you didn't let your customer have a bath at the Time did you?

Unfortunately the house is empty at the moment so no shocking bath times for anyone!

Why is it still tripping the RCD even with the element linked through? That's what was confusing me. Made me think it was an internal issue which may be beyond me if I'm honest.
 
The element is a Theeta WT7 and the RCD trips whenever this reaches set temperature....

... I hoped it'd just be the element but the problem occurs when it's been linked through which is bugging me.

The item marked Theeta WT7 is the thermostat, not 'the element'.

When you say that you've 'linked through' the element, what do you really mean?

Why did you IR the cables, but not the heating element?
 

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