Mira shower trips mcb

[art]

Transferred from Plumbing; hope electrics can help
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I have a Mira Event pumped shower using household hot water with two pole switch on wall outside bathroom. When I switch this switch on the mcb on fuseboard trips immediately. The shower valve etc hasn't been opened, i.e.no water flow and pump doesn't get a chance to come on. I have checked wiring from external switch up to shower PCB and it is fine.
Am I right in thinking that it is most likely the PCB that is at fault? Or could faulty pump or flow switch somehow cause this problem?

 

[plugwash]

are you absoloutely posistive havn't done something dumb with the wiring of the switch?

assuming it is the unit then just take the whole thing back its not your problem to work out whats wrong with it

 

[art]

No, shower worked fine for 6 or 7 years same electrics;

 

[plugwash]

oh its not a new installation sorry i misinterpreted what you said

still i think its probablly best to just replace the unit even if you did find the fault you would probablly have a hard time getting spares

 

[HandyJon]

Try http://www.showerspares.com/ for spare parts.