ERROR CODEC-20

Samsung · Microwaves

Samsung microwave C-20: Temperature-system warning

Documentation checkedBy ErrHiveUpdated October 28, 2026

THE SHORT ANSWER

Temperature-system warning.

C-20/C-21/C-22 is a temperature-related group. Codes in this family can distinguish sensing faults from excess temperature, so preserve the exact characters.

First safe check

Stop cooking and let the microwave cool before further handling.

Applies to

Samsung microwave families in the US code reference. Grouped displays can name different subconditions; the model manual controls exact interpretation.

Codes covered by this guide

C-20C-21C-22E-21E-22E-24

Before you start

Do not remove the cabinet or bypass door interlocks. Internal microwave components can remain hazardous after power is disconnected.

Go to safe checks

WHAT YOU MAY NOTICE

Symptoms to record

The microwave displays C-20.

WORK THROUGH THE BASICS

Safe troubleshooting checks

0 of 2 checked

Use the checkboxes to keep track as you read. Stop at any warning or step that does not match your appliance.

Cool before any permitted restart
Disconnect power. For an overheating display such as C-21 or E-24, allow the microwave to cool fully before any restart permitted by its manual. If the manual calls for service for a sensor fault, follow that instruction instead.
What to note
The appliance is cool and the exact-model instruction permits the next action.
Stop here if: Do not restart a hot, damaged or smoking microwave, or a model whose manual directs service.
Stop when the code returns
If C-20 or a related display returns, leave internal access to Samsung service and provide the full model and code.
What to note
The microwave is not repeatedly used with an unresolved fault.

THE DETAILS MATTER

Scope & troubleshooting notes

How to interpret this result

Samsung’s detailed guidance differentiates C-20 sensing trouble from C-21/E-24 overheating on applicable models. A broad temperature label is not permission to replace a sensor or repeatedly restart a hot appliance.

Distinct displays covered in this guide

C-21: A temperature-system condition; some models specify overheating; C-22: A temperature-sensor condition is reported; E-21: The temperature-sensor circuit is open; E-22: The temperature-sensor circuit is shorted; E-24: Temperature is above the allowed limit. These are distinct diagnostic labels grouped by the owner-level response, not interchangeable spellings.

YOUR NEXT DECISION

When to stop and get help

Stop for a repeat code, smoke, arcing, damaged door or unusual overheating. Request qualified microwave service.

Record what you see

Keep the full model number, exact displayed code, and your observations together for the next conversation.

Use the right support

Contact the manufacturer or a qualified appliance technician when the guide calls for service.

Samsung support

THE EVIDENCE

Sources & verification

Our explanations are editorial summaries of the documentation below. They do not replace the instructions for your exact appliance.

What does the error code on my Samsung microwave mean?
Samsung · Manufacturer support · Checked Oct 28, 2026
Code table and owner troubleshooting — Samsung US consumer support; check the model manual before applying a procedure.
Samsung Microwave Oven error codes - what do they mean?
Samsung · Manufacturer support · Checked Oct 28, 2026
Temperature, damper, communication and touch-key conditions — Samsung UK cross-reference; details are explicitly limited to the model manual, not assumed universal.
What are the codes for Samsung HotBlast Microwave Oven?
Samsung · Manufacturer support · Checked Oct 28, 2026
C-A1, C-F0, C-21, C-F2 and C-d0 — HotBlast models covered by Samsung Singapore; used to explain family-specific distinctions, not infer US model compatibility.

ErrHive is an independent information resource, not an authorized representative of Samsung. Follow your appliance’s manual. Hazardous repairs belong with qualified professionals. Read our safety policy.