Microwave Not Heating? What is Repairable and What is Not (India, 2026)

A microwave is one appliance where safety and economics both matter. It stores high voltage even when unplugged, so the inside is never a DIY zone - but knowing the likely fault still helps you decide whether a repair is worth it against the price of a new oven.

Never open a microwave casing yourself. The capacitor can hold a lethal charge for a long time after it is switched off. Everything below is for understanding the fault, not attempting it.

Runs but does not heat

If the plate spins and the light is on but the food stays cold, the heating component - the magnetron, or the high-voltage diode that feeds it - has failed. This is the defining microwave fault. A magnetron replacement typically runs 900 to 2,800 depending on the model and wattage.

This is also the decision point: on a basic solo microwave, a magnetron plus labour can approach the cost of a new entry-level unit, so ask for the part quote before authorising. On a convection or higher-end oven, repair almost always makes sense.

Completely dead

No display and no response usually means a blown internal fuse - often cheap - or a failed control board, which is dearer. A fuse can blow from a power surge without anything else being wrong, so a dead microwave is not automatically a write-off.

Check the socket with another appliance first to rule out a wall or plug fault before booking.

Sparking or arcing inside

Sparks during use are usually caused by the waveguide cover (a small mica panel inside) burning, or by metal or foil accidentally left in the cavity. Stop using it immediately - continued arcing damages the magnetron. A waveguide cover is an inexpensive replacement.

If you have been microwaving anything with a metal rim or trim, that is the likely cause and no part may be needed beyond cleaning and the cover.

What to do next

Because the magnetron fault dominates and drives the repair-or-replace call, always get the part quote first for a no-heat microwave. For dead, sparking or turntable faults, a diagnostic visit will usually close it the same day. Yantra4All engineers are trained to discharge and handle microwave high-voltage safely - which is exactly why this is not a DIY repair.