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.
- Remove the back panel with a screwdriver (check your manual for screw locations).
- Locate the small switches near the door latch.
- 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.
- Locate the magnetron (a metal box with fins) behind the control panel.
- Test it with a multimeter (should read low resistance). If it’s burnt out, replacement costs $50-$100.
- 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!