Main information
Don't self-diagnose it
If the RCD won't reset or trips again instantly, that's a safety signal. What's causing it can't be worked out from here: only by checking the installation in person.
Safety first
Don't force the switch repeatedly or try to isolate the cause yourself. Don't touch anything else: call and a professional electrician will come out to check it.
Next step
An electrician checks the installation on site and diagnoses where the problem is. Until then, we don't know for certain what it is.
Frequently asked questions
What if it won't reset even after unplugging everything?
It could be a fault in the switchboard itself or the fixed wiring; don't keep forcing it and get it checked.
Could it be caused by a wet or damp appliance?
It could be one of the causes, but we can't say without checking; don't unplug or test anything yourself, it's better to get it checked.
Is it dangerous to be without a working RCD?
Yes, the RCD protects against electric shock; it's not safe to use the installation without that protection active.
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