Electric oven fault finding.

[Paul Drawmer]

I have just installed a second hand oven.

Turn on supply with all off on oven - OK

Turn on top oven to grill and base heat (max drain), adjust thermostat until oven light comes on - all OK.

Adjust bottom oven to max drain, raise 'stat unitl it turns oven on. - all OK

Ovens both start warming up.

Then - Consumer unit trips (not the oven circuit breaker)

all off - restart.
This time with no temp selected (ie the heating element isn't being asked for heat) the trip goes as I use the element selector.

Is there a guide to fault finding for electric ovens? How should I best check this out?
Am I right in thinking that as the consumer unit has tripped, rather than the circuit breaker, that it's more likely to be an earth fault than a short?

The oven is a Rangemaster twin oven inbuilt, and it's green and they aren't available like this any more.

[Paul Drawmer]

Thanks for the tips - I'll try isolating which element does the tripping, when it's light!

I've been looking up the availablity of elements - they appear to be as common as rocking horse poo for model 58680.
Bother.