Samsung Microwave E-31 Error Code: What It Means & How to Fix It

Error Code Explained

What Does the Samsung E-31 Error Code Mean?

Root Causes

Common Causes of the Samsung E-31 Error Code

• 1
  Blocked Ventilation Around Magnetron

  The cooling airflow path over the magnetron fins is blocked by grease buildup or a failed fan, causing heat to accumulate at the magnetron body.
• 2
  Failing Cooling Fan

  A worn cooling fan running at reduced speed cannot adequately cool the magnetron during full-power cooking cycles, triggering E-31 on extended use.
• 3
  Magnetron Nearing End of Life

  As a magnetron ages, its efficiency decreases and it dissipates more energy as heat. An aging magnetron runs hotter and is more prone to E-31 during long cooking cycles.
• 4
  Operating with No Load

  Running the microwave empty allows all magnetron energy to reflect back into the magnetron, rapidly overheating it and triggering E-31.
• 5
  Magnetron Temperature Sensor Failure

  The sensor itself has failed and is reporting an incorrect overtemperature reading even when the magnetron is at normal operating temperature.

Step-by-Step Guide

How to Troubleshoot the E-31 Error Code

1. 1
   Allow the unit to cool completely

   Unplug the microwave and allow it to rest with the door open in a well-ventilated area for at least 30 minutes. Restore power — if E-31 clears and does not return during normal use, the event was a one-time thermal peak.
2. 2
   Check ventilation clearances

   Ensure the top and sides of the microwave are clear per the installation manual clearance requirements. For over-the-range models, confirm the internal vent filter is not heavily grease-coated.
3. 3
   Never run the microwave empty

   Always have food or a microwave-safe cup of water in the cavity when operating. An empty microwave is the fastest way to cause magnetron overheating.

Professional Service

When to Call a Samsung Technician

FAQ

Frequently Asked Questions — Samsung E-31

• Does E-31 mean my Samsung microwave magnetron is dead?
  Not necessarily — a single E-31 that clears after cooling means the magnetron reached its thermal limit but was not permanently damaged. The protective shutdown worked as intended. Repeated E-31 events indicate the magnetron or cooling system is failing and a technician should inspect the unit.
• Can E-31 and E-63 appear on the same Samsung microwave?
  Yes — E-31 monitors the magnetron component temperature and E-63 monitors the cavity/internal ambient temperature. Both are overtemperature codes but for different components. If both appear regularly, the cooling system has failed and is not adequately protecting any of the internal components.
• How long does a Samsung microwave magnetron last?
  Under normal use — cooking food (not running empty), with adequate ventilation — Samsung magnetrons typically last 8–12 years. Chronic overheating events (E-31, E-63) significantly shorten magnetron life.