The most common microwave faults, which ones are safe to check yourself, and why microwave repair carries risks other appliance repairs don’t.
Microwaves fail in fairly predictable ways, but they’re also one appliance where DIY troubleshooting has real limits — the high-voltage capacitor inside can hold a dangerous charge even when the unit is unplugged.
Microwave doesn’t turn on Check the door is closing fully first — most microwaves have a safety interlock that prevents operation if the door isn’t sensed as closed. If the door is fine and it still won’t start, the issue is usually the door switch, fuse, or control board.
Turntable not rotating Usually a simple mechanical fault — a worn drive coupling or motor — and one of the easier microwave repairs, generally affordable to fix.
Food not heating despite the unit running Points to a failing magnetron, the component that actually generates the heat. This is a genuine repair, not a DIY fix, and worth having assessed before assuming the unit is beyond repair — replacement magnetrons are available for many models.
Sparking inside the unit Stop using the microwave immediately. This is often caused by metal (even small flecks) inside the cavity, but can also indicate a failing waveguide cover or internal arcing — both need inspection before further use.
Unusual noise during operation A grinding or rattling noise often points to the turntable motor or support rollers — usually minor, but worth checking before it affects other components.
Why microwave repair isn’t a full DIY job
Even unplugged, a microwave’s high-voltage capacitor can retain a dangerous electrical charge, which is why opening the casing isn’t something to attempt without the right training and discharge tools. Checking the door seal, the turntable, and the power connection is reasonable; opening the internal casing is not.
Microwave acting up? Book a repair visit rather than opening the casing yourself.