Written by
Adrian Soto Appliance Repair Content SpecialistPublished September 5, 2026Updated October 20, 2026
Error codeE-21
ApplianceMicrowave
Quick answer
E-21 on a Samsung microwave is a open temp sensor error. Try the manual's power reset and request service if it returns.
Model compatibility: Samsung reuses codes across series and model years, so E-21 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Open temp sensor error.
E21 and E-21 are two spellings of one Samsung microwave message, a open temp sensor error.
This is a current-series entry for Samsung microwaves.
Reset steps from the manual
Cycle the power: off at the plug or breaker, a pause for drying or 60 seconds, then on again. If the display lands on E-21 again, request service.
Codes easily confused with E-21
E-22 is the short temp sensor error entry. E-23 is the T1 max time error entry. E-24 is the over temperature error entry.
Samsung microwave repair in Los Angeles
Los Angeles owners can reach us at (310) 896-4231 when the display keeps showing the code. Our microwave repair page lists what we handle. Keep the model number and a note of what you already tried close by.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
