Written by
Nadia Okafor Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeC-20 / C20
ApplianceMicrowave
About C-20
The temperature sensor is the subject of C-20, also seen as C20. Samsung places it on the same row as C-21 and C-22, and the row has a single description. The entry covers microwaves of the current generation.
Checklist
Switch off power at the outlet or the breaker.
Ask yourself if moisture, such as a spill or cooktop steam, has been near the electronics. If so, wait for it to dry.
If nothing was wet, leave the microwave for a minute before turning power back on.
Same code again? The manual says to request service.
Where C-20 persists, contact us on (415) 969-6153 about Samsung microwave repair for San Francisco and the Bay Area. Bring up the code, your model number and what the reset changed, if anything.
Model compatibility: Samsung reuses codes across series and model years, so C-20 / C20 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
C-20 reports an error with the temperature sensor on a current-generation Samsung microwave.
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.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
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Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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Book a repair online or call us — clear estimates and approval before any repair work begins.
