How to Fix a Samsung ME731K Microwave Not Heating From 2015

What’s Stopping Your Samsung ME731K Microwave From Heating?

If your Samsung ME731K microwave isn’t heating, the problem could be a blown fuse, a faulty magnetron, or a broken component from years of use. This 2015 model is reliable, but wear and tear can take its toll. Here’s how to fix it yourself and avoid a costly replacement.

Tools You’ll Need

• Phillips screwdriver
• Multimeter (for testing components)
• Replacement fuse (10A or 20A, check manual)
• Safety gloves

Step 1: Safety First—Unplug the Microwave

Disconnect your Samsung ME731K from the power outlet. Microwaves store high voltage even when off, so never skip this step.

Step 2: Check the Door Switches

Faulty door switches can prevent heating.

1. Remove the back panel with a screwdriver (check your manual for screw locations).
2. Locate the small switches near the door latch.
3. Test each with a multimeter—replace any that don’t show continuity when pressed.

Step 3: Test the High-Voltage Fuse

A blown fuse is a common culprit.

• Find the fuse inside the casing (usually a white ceramic tube).
• Use a multimeter to check for continuity—if it’s dead, replace it with an identical fuse (available at hardware stores).

Step 4: Inspect the Magnetron

The magnetron generates heat—if it’s faulty, your microwave won’t heat.

1. Locate the magnetron (a metal box with fins) behind the control panel.
2. Test it with a multimeter (should read low resistance). If it’s burnt out, replacement costs $50-$100.
3. Warning: Discharge the capacitor first (consult a pro if unsure).

Step 5: Check the Diode and Capacitor

These parts support the magnetron.

• Test the diode with a multimeter (one-way current only)—replace if faulty ($10-$20).
• Inspect the capacitor for burns or leaks—replace if damaged.

Step 6: Reassemble and Test

Put everything back, plug in the Samsung ME731K, and run a test with a cup of water for 1 minute. If it heats, you’ve fixed it!