I think I need a new oven - electric tripping

[NeverDropYourMooncup]

Potentially a @pigletjohn post, but I'm happy for anybody with electrical knowledge to say - the only thing not helpful would be 'why don't you do it yourself?' as that isn't going to happen.

I know the oven has been on its last legs for years, as it only has two temperatures - off and hotter than the surface of the sun - and the seals aren't particularly good, but we've been too skint to think of doing anything about it.

Over the last couple of days, the RCD controlled circuits breaker on the consumer board has started tripping whenever the oven is turned off.

I think that it's time to bite the bullet and buy another oven, as it only cost about £110 in the first place, so replacement thermostat, seals and getting somebody to do it because DP might just die of terror if he thinks I'm doing something electrical (and I couldn't lift it out without his help) would be chucking good money after bad.

There are no mice in the back of the cabinet chewing wires, no leaks or problems with any other appliances in the kitchen, so I'm pretty sure that it's the oven.

The breaker that's tripping is the 63A labelled RCD rather than the single Cooker one. The fridge, freezer, dishwasher and extractor fan are perfectly happy and functioning normally (each is on one of the four dedicated switches, rather than an orange one), as is the hob on another orange switch, both around 15 foot from the actual hot zone.

My questions are;

1. Am I likely to be right that it's the oven, not anything else?

I know it's a hardwired connection at the back. The consumer unit was installed when the house was built in 2011 and was last given a clean bill of health in 2020 (next recommended inspection is 2025). The CU has a trip for the cooker labelled Hager MTN 132 B32 6000 3 and the switch that is tripping is Hager CO 263U 63 A. The main red breaker is unaffected by any of this (SB 299U 100 A 400 V 50 Hz AC 22A IEC 947-3).

1. I don't want to pay out for an oven and installation to find out that the electrician says 'you can't have this one' - is the information I've provided above enough to be able to say that there are unlikely to be any issues with any standard oven available from AO?

I expect I'm being overcautious, but the cost of a new oven and installation is lot of money for me, so i don't want to get it wrong.

Thank you!

Is there any chance you got the element wet? That would make it trip.

the rcd trip is most likely due to age breakdown of the oven heating element. the temperature control is probably due to failure of the thermostat. both of these can be replaced but it is probably not worth it.

from what you say, the cooker is supplied from a dedicated circuit with a 32A MCB which is adequate for any normal domestic cooker. Some very large ranges may need more.

check that nothing else goes off when you turn off the 32A cooker MCB. A washer or dishwasher might matter; a tumbledrier would. An electric shower would be a major problem.

btw the "big red breaker" will be a 100 Amp main switch, it is not a breaker and will not trip.

btw when you say "oven" do you mean "oven?" Not "cooker?" What sort of hob have you got?

Thank you! (sorry for the incorrect terminology).

It's a standard built in single oven in a run of kitchen units topped with laminate countertop.

The gas hob is above the oven - there's a 3 point socket at the back of the next cupboard that it plugs into - it is also isolated with an orange switch across the kitchen - when the RCD trips, that won't spark up, but as soon as the CU has been reset, everything's fine with it.

The shower is on a separate block which has switches for upstairs sockets, downstairs sockets, kitchen sockets, central heating and shower and a mystery unlabelled one (doorbell maybe?) along with another RCD switch. That has never tripped.

A 32A circuit is ample.

Turn off the MCB only (not the RCD) to see what else it supplies.

btw a 32A cooker circuit is enough for a double oven, plus electric hob, or a large electric cooker should you desire one. It's typically provided for a cooker circuit as the housebuilder doesn't know what sort of cooker you might want, and this is adequate for any normal domestic setup. It does not usually have a plug socket, just a big connector on the wall, though you can have a socket if you want.