Is It Worth Repairing My Microwave?

Average UK labour and parts costs — always get multiple quotes from local engineers.

A microwave should last 7–10 years with normal use. Built-in integrated models often last longer (10–15 years) as they're less prone to being moved and knocked around. Cheap countertop models may only last 3–5 years.

For basic countertop microwaves worth under £100, repair rarely makes financial sense — you're close to or above the replacement cost. For built-in or integrated models (£200–£600+), repair is almost always worth it. The magnetron (the part that generates microwave energy) is the most expensive component — if that fails on a cheap model, replace it.

The type of microwave you own is the biggest factor in whether repair makes sense. Countertop microwaves (£50–£150) are the most common in UK kitchens and are generally cheap enough to replace when they fail. Built-in or integrated microwaves (£200–£600) are fitted into kitchen cabinetry and designed to match other appliances — replacing them means finding an exact-fit model, which makes repair much more attractive. Combination microwaves (£150–£400) offer grill and convection oven features alongside standard microwave cooking. These are pricier to replace and more complex, but their additional components also create more potential failure points. If your microwave is integrated into a fitted kitchen, always explore repair before assuming replacement is the only option.

• Food heats unevenly or takes much longer than usual — this suggests the magnetron is weakening, which is the most expensive component to replace.
• Sparking inside the cavity — sparks can be caused by damaged waveguide covers (cheap fix) or internal arcing from a failing magnetron (expensive fix).
• Door doesn't close or seal properly — a microwave that won't seal is a safety concern, as it may leak microwave radiation. Door switches and hinges are repairable, but a warped door frame usually isn't.
• Burning smell during operation — a persistent burning smell (not from food residue) can indicate failing electrical components and should be investigated immediately.
• Keypad or display malfunctions — on older models, control board replacements can cost more than a new countertop unit.

Microwaves are one of the most energy-efficient cooking methods available. A typical 800W microwave uses roughly 50% less energy than a conventional oven for the same reheating task. Under current UK energy prices, running a microwave for 15 minutes costs around 5–7p, compared to 15–20p for a full-size oven. Since 2024, UK microwaves carry EU-derived energy labels to help consumers compare efficiency. If your current microwave is over 10 years old, newer models may offer improved standby power consumption — modern microwaves draw less than 1W in standby, while older models can draw 3–5W continuously. Over a year, this seemingly small difference adds up. The running cost of a microwave is so low that energy savings alone rarely justify replacement, but it's a useful bonus when you do upgrade.

Microwaves are among the most affordable kitchen appliances to replace, so it's worth weighing repair costs carefully. That said, some simple fixes can extend its life for very little outlay — while other faults should never be tackled at home due to the risk of electric shock from stored capacitor charge.

Safe DIY Repairs

• Replacing a worn or damaged turntable motor — save £30–£50. A straightforward swap on most models — unplug, remove the base panel, and fit the new motor. Replacement motors cost around £10–£20 online.
• Fixing a faulty door latch or switch — save £25–£45. Door switches are a common failure point. Replacement micro-switches cost under £5, but always unplug the unit and discharge the capacitor first if you're confident doing so.
• Cleaning or replacing the waveguide cover — save £20–£35. A burnt or damaged waveguide cover causes sparking. Replacements cost just a few pounds and simply slide into place inside the cavity.

Always Hire a Professional

• Magnetron replacement (£60–£120) — The magnetron generates microwave radiation and operates at dangerously high voltages. Incorrect handling risks fatal electric shock even when unplugged, due to stored charge in the capacitor.
• High-voltage capacitor or diode faults (£50–£90) — Capacitors retain a lethal charge long after the microwave is unplugged. Only a qualified appliance engineer should discharge and replace these components.

Given that a decent new microwave starts from around £50, professional repairs costing over £60 rarely make financial sense — our calculator will help you decide.