A friend of mine rents a flat out and the tenant has just advised that the RCD tripped out whilst the tenant was on holiday (result - fridge/freezer defrosted). Apparently it has tripped on occasions before but the tenant can't remember when (and obviously decided not to bother telling my friend).
The installation has been safety checked/certified before it was re-let, and had not been a problem with the previous tenant.
How are faults like this normally diagnosed? Seems to me an electrician could come along and test it and find nothing, since its so intermittent. None of the breakers had tripped apparently.
TIA, Midge.