Samsung Microwave E-31 Error: Inverter circuit fault
If your Samsung appliance is showing this error, you’re dealing with a samsung microwave e-31 error. Here’s everything you need to know about diagnosing and fixing this issue. Samsung e-31 error code — here is what you need to know. What It Means Error code E-31 on Samsung microwaves indicates a failure in the inverter […]
No
DIY Fixable
From $180
Typical Repair Cost
45-90 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe.
Can I reset the code?
Yes.
When to stop immediately?
Stop if you notice: You hear arcing, popping, or sparking sounds from inside the microwave during a cook attempt, A burning electronic smell comes from the rear or bottom ventilation area of the unit.
Symptoms You May Notice
Microwave produces no heat at any power level
The turntable spins and the light comes on, but the inverter cannot deliver power to the magnetron, so food remains completely unheated.
Unit shuts down seconds after starting a cook cycle
The microwave begins a cycle but the inverter board detects a fault and cuts power within a few seconds, displaying E-31.
Intermittent heating at lower power settings
The microwave heats food inconsistently — working at some power levels but failing at others — indicating partial inverter circuit degradation.
E-31 appears after a power surge or thunderstorm
The error code first appeared following an electrical event, suggesting voltage spike damage to the inverter board components.
Possible Causes
Power surge damage to inverter board
Voltage spikes from lightning or utility switching destroy sensitive power transistors and control ICs on the inverter board, which has no built-in surge protection.
Requires ProfessionalOverheated inverter components
Blocked ventilation causes the inverter board to run at elevated temperatures, cracking solder joints and degrading power transistors over months or years of use.
Requires ProfessionalFailed IGBT power transistor
The insulated-gate bipolar transistors that switch high-frequency power to the magnetron can fail from thermal stress, immediately disabling the inverter output.
Requires ProfessionalSafe Checks You Can Do
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1
Check ventilation clearances
Inspect all ventilation openings on the microwave — top, rear, and sides. Remove any items stored on top of or directly behind the unit that could block airflow. On Over-the-Range models, verify at least two inches of clearance above.
Blocked ventilation is the most common preventable cause of inverter failure on Samsung Over-the-Range microwaves.
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2
Power cycle for ten minutes
Unplug the microwave from the wall outlet for a full ten minutes to allow the inverter board capacitors to fully discharge. Plug it back in and attempt a cook cycle at 50 percent power.
Testing at lower power first reduces stress on a potentially damaged inverter and may reveal partial functionality.
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3
Test on a different outlet
If the microwave is a countertop model, try plugging it into a different outlet on a separate circuit to rule out a household wiring issue causing voltage irregularities.
Samsung microwaves require a dedicated 20-amp circuit — sharing with other large appliances can cause voltage drops that stress the inverter.
When to Call a Professional
Contact a qualified technician if:
- E-31 returns immediately on every cook attempt after a full power cycle reset
- The microwave heats at some power levels but not others, indicating partial inverter failure
- E-31 first appeared during or immediately after a thunderstorm or power outage
Need Professional Help?
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