What to do when Microwave oven not warming up food?
Warranty on microwave oven just run out?
Your food is just as cold as before inserting for heating.
Microwave looks like it worked normally, the timer counts down to the end of the heating process, the plate turns as normal.
But food is still cold.
Most common fault is small glass fuse has burned.
How to replace that fuse?
Taking apart microwave can be very dangerous if you do it improperly...
There is an high voltage capacitor in there that can be still charge and can give out an lethal shock.
This fuse is placed next to the transformer in white tube.
Before you do anything in faulty apliance make sure is disconnected from mains.
Capacitor may hold electricity, need to be discharged before perform any repair.
You can wait for least 30 minutes to discharge capacitor itself or using insulated pliers connect 2 capacitor connectors.
You may get an loud "SNAP" (which is unlikely) and that indicate the capacitor is discharged, do this a few more time to really make sure the capacitor is discharged..
Open the tube using screw driver, replace fuse with new fuse.
Close the tube and place in designed area.
Before close the microwave oven case make sure that high voltage wires are away from fan blades.
Close the microwave oven case, make sure no gaps left.
About 15 minutes of work and your appliance back to life.