Probably a loose connection at the shower, shower isolator or the consumer unit but it could also be caused by water getting into the shower unit or just a knackered heating element.
Turn off all the electric and confirm that the installation is dead, then remove the front of the shower and look for loose connections or signs of burning/overheating. If everything looks ok then check the shower isolator. If you still don't find a problem, and you consider yourself competent to do so, you can check for problems inside your consumer unit. Unless you have a main isolator switch before your consumer unit the meter tails entering the top of the main switch will ALWAYS BE LIVE! So be very careful when poking around in there. If you still don't see any obvious problem you really need an electrician to perform some tests for you.
Probably a loose connection at the shower, shower isolator or the consumer unit but it could also be caused by water getting into the shower unit or just a knackered heating element.
Hmmm.........sounds like the eliment in the shower is faulty, the shower trst for water flow before turning on, hence it runs for a second before it trips.
Care to explain why?sorry but i don't think you should be giving "advice".
Care to explain why?sorry but i don't think you should be giving "advice".
What kind of fault in an isolator, visually obvious, would trip an RCD after a few seconds of a downstream device being turned on, but would cause no problems at other times?If everything looks ok then check the shower isolator.
What kind of fault in a CU, visually obvious, would trip an RCD after a few seconds of a downstream device being turned on, but would cause no problems at other times?If you still don't find a problem, and you consider yourself competent to do so, you can check for problems inside your consumer unit.
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