Oven tripping the circuit breaker
The oven is relatively new - just a couple of years old but little used as we have an air fryer that does most of our cooking. Switched it on a few days ago and after about 15 minutes it had heated up and was cooking ok but then the circuit breaker tripped. After resetting the circuit breaker we switched it on but this time it tripped again immediately as soon as the function switch clicked on to the first oven setting.
I though it might be the element - it didn't look damaged but I bought a new one anyway and installed it but the problem was still the same. I have noticed that even the oven light, which is the first click on the function switch, doesn't light up, but at that point it doesn't trip the circuit either.
I removed the oven and looked at the function switch but it is like new - no evidence of burn marks or arcing so I don't think that is the cause of the problem. I am relatively competent as a fixer of broken things, but I'm not sure what the cause might be. My consumer unit is not old either, but clearly something is wrong somewhere...
Any diagnosis gratefully received...!
4 Answers
It does sound like a genuine oven fault rather than the consumer unit, especially as it now trips as soon as a heating function is selected. The fact the light position does not trip, but also does not illuminate, is a useful clue.
1. First identify what is tripping. If it is the MCB, that suggests overload or short circuit. If it is the RCD/RCBO, that points more towards leakage to earth, often from an element, wiring, fan motor or thermostat. This helps narrow it down.
2. Check the oven lamp itself. A failed lamp would explain why the first light-only position does nothing, but it would not normally trip the breaker on heating. So this may be a separate fault rather than the main cause.
3. Disconnect power at the mains before inspecting anything internal. Then disconnect one wire at a time from each load and insulate it safely, testing each circuit separately. On this model that usually means checking the grill element, fan oven element, circular fan motor, oven lamp holder/wiring, and possibly the cooling fan. If it only trips on one function, the fault is on a component used in that function.
4. Pay particular attention to the fan motor and any wiring near hot areas. An oven that has been little used can still suffer insulation breakdown once heated, or brittle wiring can short to earth when disturbed.
5. Check for moisture or contamination in the lamp holder, terminal block, and switch area. Grease, carbon tracking, or damaged insulation can cause immediate tripping.
6. If you have a meter, continuity checks may find a dead short, but insulation leakage faults often need a proper insulation resistance test to confirm.
If you need parts, only use the Whitegoods Help Spare Parts Shop and search by the full model number. If it is tripping an RCD/RCBO and you cannot isolate the faulty circuit safely, it is best to get a qualified engineer, especially for any mains electrical work.
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SAFETY FIRST: READ BEFORE ACTING ON THIS GUIDANCE
Never work on a live appliance
Always unplug it at the mains before going near it with any tools.
Never attempt gas work
By law, gas appliances must only be worked on by a Gas Safe registered engineer. If your fault involves gas, stop and call a professional. Do not attempt it yourself.
Watch for sharp edges
Outer panels are smooth, but internal parts have sharp machined edges. Wear protective gloves and arm sleeves.
Water appliances can leak
Turn off the water supply before disconnecting any hoses.
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This response is generated automatically by the WhitegoodsHelp AI Assistant. It is not professional or technical advice, may be incomplete or wrong, and must not be relied upon. Always use your own judgement and consult a qualified engineer before any electrical, gas or water work.
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Hi Dave,
Which element did you replace? And if you let it all cool down, does it still trip straight away or after the same 15 minutes or so?
Hi, thanks for replying - the replies went into my Junk folder and I've only just spotted it! To answer your question, I replaced the main element in the top of the oven with a brand new part from Zanussi, but it does still trip immediately. Even from cold, the trip happens immediately. I can't see any other visible signs of burning, or loose connections, and it seems such a simple device with relatively few components - very frustrating...
Hi Dave,
It sounds like you replaced the below, which is the Grill Element:
I suspect that you need this:
Which is the Fan Element - But that needs inspecting and checking first.
If you look at the rear of the appliance cavity, you will see some screws to take off the back panel - You will then see the circular element.
Remember to disconnect / isolate any power supply before taking any tools to the oven - Or, if this is something you'd rather not manage, you can find an engineer here:
Thanks again for you reply - just to let you know, I have completely disconnected the oven from its power supply and understand the need for working safely. I've taken the rear panel off of the oven and can see the connections for the round oven element that you mentioned in your reply. I measured across the terminals (after disconnecting the wires) with my multimeter. I set the multimeter to the 2000 ohms setting and it gave me a reading of 027. I'm not absolutely sure if that tells me the element is ok, but I understand that if it was short circuiting it would read 001 on the multimeter? What do you think?
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