The_Trician
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MK is the way to go - dear but good.
Reason why test button doesn't work? Well firstly, the thing has to be switched on. Secondly, the thing has to be connected up correctly - is your 'mate' a sparky?
If neither of these are not the cause, then the RCD unit itself might be U/S. Its not unusual to find one dead-on-arrival straight out the box, but it is rare.
Is any of this gear second-hand by the way?
TT
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