Microwave not starting?

A failed control board cannot process keypad inputs or relay power to any functional components, causing a completely dead unit.

Likely causes · most likely first

D.P. Circuit (Control Board)

Moderate DIY Part: $60–$150
Door (Outer Panel)

Moderate DIY Part: $8–$20

A faulty door assembly with a failed interlock switch prevents the control circuit from enabling any operation for safety.
Cooling Fan Motor Assembly

Moderate DIY Part: $20–$50

A seized cooling fan motor can draw excess current and trip internal thermal protection, locking out the microwave from starting.
H.V. Inverter Power Supply

Call a Pro Part: $60–$180

A shorted inverter board can trip the main fuse, rendering the entire microwave dead with no display or response.

See the faulty part in 3D.

Tap a highlighted part to see exactly why it fails, how to verify it's the problem, and how to replace it.