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nafuk nafuk is offline
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Default MCB tripping - why?

Hi, the MCB on my split circuit consumer unit is tripping
sporadically, sometimes when nothing is connected to the downstairs
socket circuit. The MCB protects the RCD protected circuits (upstairs
and downstairs sockets, cooker, hot tank, kitchen sockets). The hot
tank and cooker circuits are turned off at the rcd and are not
connected used/connected yet.The light (non-RCD'd) circuits stay on
when the RCD trips.

Please can someone tell me what causes an MCB to trip, other than
overcurrent, and not trip an RCD, and hopefully some possible things
to check in order to locate the fault.

This 'may be' heating associated but does happen when the heating is
off and the boiler is off i.e. could it be associated with hot pipes
near a cable?

Many thanks.