Electic shower power hunting

Joined
17 Jun 2011
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Location
Wiltshire
Country
United Kingdom
I have just installed a new electric shower (9Kw) with a 40A mcb connected to a RCD and then to a 40A switch to control supply to shower via 6mm cable. When I turn on the shower the power hunts (on/off repeatedly), the mcb + rcd do not trip but the socket mcb does.

Help any ideas please.
 
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I hope its 10mm² cable and not 6mm² :/

Depending on cable run, clipped, free, conduit, insulation etc.
 
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Not even if flow valve is allowing some water through, then the overheat stat cuts out?
 

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