trip switch doesn't trip when tested

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lisa
trip switch doesn't trip when tested

Hi all I have just discovered that when I connect my van to the 240 v hook up and then press the trip switch it doesn't trip out.Any one got any ideas about how to find out what the fault is? Also my fridge doesn't work from the hook up(works fine on gas and 12v) but the plug socket works so power is getting into the van!

Any help would be gratefully recieved

Many thanks

Lisa