Oven or cooktop not working

Oven not working: the appliance, the circuit, or the connection

An oven that has stopped is one of three things: the appliance itself, the circuit feeding it, or the connection between the two. Which one it is decides whether you need an appliance technician, an electrician, or a new oven. Working that out first is what saves you money.

Check these things first, in this order

• Look for the isolating switch. Most ovens and cooktops have a dedicated switch on the wall nearby, often in the adjoining cupboard, the pantry, or behind a splashback panel. They get knocked off by cleaners, kids and anyone sliding the fridge across. This is the single most common reason an oven is dead and it costs nothing to check.
• Go to the switchboard. Find the circuit breaker labelled oven, stove or cooktop. If it is tripped, turn every oven and cooktop knob off first, then reset it once. If it holds, you had a one-off. If it trips again straight away, or trips the moment you turn an element on, leave it off and call us.
• Note exactly what still works. Cooktop fine but oven dead? Clock and light on but no heat? Everything dead including the display? Grill works, fan oven doesn't? That detail narrows the fault down enormously and it is the first thing we will ask you.
• Check whether anything else went out with it. If power points nearby died at the same time, you have a circuit or safety switch problem rather than an oven problem, and the fault finding page is the better place to start.

What it usually turns out to be

Across hundreds of oven and cooktop jobs, the connection behind the appliance is the standout. Ovens are hardwired into a terminal block sitting in the hottest, most cycled part of your kitchen. Over years the screws relax slightly, resistance rises, the joint heats, and eventually you get a browned or charred terminal, a burnt neutral, or brittle insulation on the tails. The oven is often perfectly fine. The connection has cooked itself.

Next most common is an element failing to earth. A grill or fan element develops a leak, the safety switch drops, and everything on that circuit goes off the second you select that function. The isolating switch itself also wears out. Up here corrosion plays its part, with salt air and wet season humidity getting into terminals and switch mechanisms in coastal kitchens, especially outdoor kitchens and BBQ areas around Port Douglas and Craiglie. Holiday lets and rentals see faster wear again, simply because the oven gets used harder by more people.

Induction cooktops are their own category. They draw more than the old ceramic unit they replace, they generally need their own dedicated circuit, and the existing switchboard may have no spare way or not enough capacity to give them one. People usually find this out after the appliance is already sitting in the driveway. If you are planning a new cooktop, get the circuit checked before you buy, not after. Sometimes it is a straightforward new circuit, sometimes it means a switchboard upgrade, and knowing which changes the budget.

What not to do

Do not keep resetting a circuit breaker that trips repeatedly. It is doing its job, and something on that circuit is either leaking to earth or drawing more than it should, which means heat somewhere you cannot see.

Do not pull the oven out and undo the terminal block cover to have a look. That block stays live with the oven switched off. Locating a fault is energised electrical work under Queensland law, and that is licensed work with specific controls around it.

Do not buy a replacement oven until someone has confirmed the old one is actually the problem. We have replaced plenty of terminal blocks on ovens the owner had already written off.

What we do when we get there

We isolate, test the supply at the connection point, and inspect the terminal block and tails. Insulation resistance testing on the appliance tells us whether the fault is inside the oven or in your wiring, which is the answer you actually need. We check the circuit breaker, the safety switch and the cable size, and if you are planning a new appliance we check what the switchboard can carry. Installation work is covered by a Certificate of Testing and Compliance. If the fault is inside the appliance we will tell you that plainly, and you can decide about repair or replacement knowing the wiring behind it is sound. More detail on ovens and cooktops, or call us and we will talk it through.

Sources: WorkSafe Queensland, testing and energised electrical work; WorkSafe Queensland, certificates of compliance.