Quick Answer
Before assuming your microwave needs replacing, check the door latch, power outlet, fuse, and turntable motor — these account for most microwave faults and several can be checked without any tools.
A microwave that hums but won't heat is a different fault to one that won't turn on at all — the cause and urgency are not the same.
A microwave that suddenly stops working can feel like it needs replacing immediately — but several common faults have a quick explanation, and some can be checked yourself in under five minutes.
Here's a step-by-step guide to work through before deciding whether to repair or replace.
5 Things to Check First
- Confirm the door is closing and latching fully — most microwaves won't run with a faulty door switch
- Test the power outlet with another appliance to rule out a power issue
- Check the household circuit breaker hasn't tripped
- Listen for a humming sound with no heat — this points to the magnetron or high-voltage diode
- Check if the turntable is turning — a stuck turntable motor is a simple, low-cost fix
When It's a Door Switch Issue
Modern microwaves have safety interlock switches that prevent operation unless the door is fully closed and latched. If the door doesn't feel like it's clicking shut properly, or the microwave won't start even with the door closed, this is one of the most common — and most repairable — faults.
When Repair Makes More Sense Than Replacement
Door switches, turntable motors, and fuses are generally low-cost, quick repairs worth doing on almost any microwave. A failed magnetron on an older or budget model is the one case where comparing repair against a new unit is worthwhile.
Frequently Asked Questions
Why won't my microwave turn on at all?▼
Check the door latch, power outlet, and circuit breaker first — these are the most common causes of a microwave that won't power on.
My microwave hums but doesn't heat food — what does that mean?▼
This usually points to a fault with the magnetron or high-voltage diode, which generates the heat. It needs a technician to diagnose safely.
Is it safe to open up a microwave myself?▼
No — microwaves store high-voltage electrical charge even when unplugged, and opening the casing should only be done by a trained technician.
Is it worth repairing an older microwave?▼
For simple faults like a door switch or turntable motor, yes. For a major component like the magnetron on a low-cost or older unit, it's worth comparing against the price of a new model.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.