Microwaves sit in an unusual spot compared to other appliances: cheap parts (the turntable motor, the door switch) are genuinely worth repairing, but the magnetron — the part that actually generates the microwave energy — is often expensive enough on its own that replacing the whole unit makes more sense, especially on a countertop model.
Typical repair cost by fault
| Common fault | Relative cost | Notes |
|---|---|---|
| Turntable not turning (motor or coupler) | Low (often DIY) | See our turntable troubleshooting guide — frequently a cheap part |
| Door switch (interlock) | Low | A common safety-switch fault that stops the unit from running at all |
| Control panel / touchpad | Low–moderate | Cost depends heavily on part availability by model |
| Diode or capacitor (high-voltage circuit) | Moderate | Requires a technician familiar with the safety risks of a microwave’s high-voltage circuit |
| Magnetron | High | Frequently comparable to or more than the cost of a new countertop microwave |
Why the magnetron is usually a replace-the-unit fault
The magnetron is the component that actually produces the microwave energy that heats food, and it is one of the more expensive individual parts in the appliance. On a standard countertop microwave, a magnetron replacement (part plus labour) frequently costs close to, or more than, buying a new unit outright — countertop microwaves are relatively inexpensive as a category, which tips the maths toward replacement almost every time.
- Confirm it is actually the magnetron
A microwave that runs (light on, turntable spinning, fan running) but does not heat food points toward the magnetron or the high-voltage circuit feeding it — see our buttons and controls guide if the issue is instead that it will not start at all.
- Get a quote before committing
Ask specifically whether the quote is for a magnetron replacement, and compare that number directly against a new unit of similar size and features.
Countertop vs built-in/over-the-range models
The maths shifts for built-in and over-the-range microwaves. These units are more expensive to begin with and are often integrated into cabinetry, so replacement involves more than just buying a new box — matching dimensions, trim kits, and installation labour all add to the replacement side of the comparison. A magnetron repair that would not be worth it on a $60 countertop unit can be worth it on a $500 built-in model.
When repair still makes sense
Turntable motors, door switches and control panels are all genuinely worth repairing on most microwaves — these are inexpensive parts with straightforward labour. It is specifically the magnetron and high-voltage circuit faults where the cost comparison usually favours replacement on cheaper countertop units, and favours repair on more expensive built-in installations.
Stop and call a qualified appliance technician or electrician if you find scorched or melted wiring, smell burning, see water that has reached electrical components, or if the fault returns immediately after a repair. Never bypass a safety device — thermal fuses, door interlocks and flood switches fail for a reason, and defeating one converts a broken appliance into a fire or flood risk.
