Samsung C-20 fault codewhat it means and how to fix it
A sensor fault. Samsung group four codes here — and one of them, C-23, is in every UK manual and missing from their website entirely.
Take care
What C-20 means
Samsung’s manuals group C-20, C-21, C-22 and C-23 into a single row headed sensor malfunctions, with one shared remedy: turn off the oven and restart, and if the problem continues, turn off all power for 30 seconds or more and reconnect, and if that does not fix it, contact a service centre.
Samsung’s website reproduces exactly that group as C-20, C-21 and C-22, and drops C-23. We checked all four UK manuals — Series 4, 5, 6 and 7 — and C-23 is in every one of them. So if you are here because your oven shows C-23 and Samsung’s own site told you no such code exists, nothing unusual has happened to your appliance. It is a sensor code, identical in Samsung’s treatment to the three published beside it, and the omission is one character of website copy.
As for what the codes mean, Samsung give you two words and no distinction between the four numbers. An oven relies on temperature sensing to hold a set temperature, so a sensor fault is the sort of thing that produces an oven that will not heat, will not hold a temperature, or cuts out mid-cook.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| A temperature sensor or its wiring has failed | The reasonable reading of Samsung’s two-word description. An open or short circuit anywhere in the sensor path reports the same way as a failed probe. | Common |
| A transient fault a power cycle clears | The possibility Samsung’s remedy is built around, since they have you restart and then power cycle before escalating to a service centre. | Common |
| A connection problem between the sensor and the control board | Distinct from a failed sensor and indistinguishable from outside the appliance, which is why the diagnosis belongs to whoever opens it. | Occasional |
What to try yourself
Turn the oven off and restart it, which is Samsung’s first published step.
If it returns, turn off all power for 30 seconds or more and then reconnect — at the plug if the oven has one, otherwise at the cooker switch or the breaker. Samsung install these ovens either way.
Set the clock once power is restored. Samsung’s troubleshooting guide says an oven that will not start may simply have no time set, so a reset that leaves the clock blank can look like a failed reset.
If the code persists, contact a service centre and quote the exact code including the number, since the four in this group mean different things to an engineer.
Get a qualified appliance engineer to look at your Samsung C-20
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified appliance engineer, tell them the make, the model and the exact code or message on the display, and ask whether they carry parts for this make — that is what turns one visit into a repair rather than a quote.
What it costs to fix
Typical repair cost
£90–£200
Time on site
10 minutes
An oven temperature sensor is typically £20 to £45 as a part, with the visit making up most of the cost. Nothing at all if a power cycle clears it.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Own this appliance and had this code? . Nothing is published until a person has read it.
Related Samsung fault codes
- C-d1Get it checkedDoor lock malfunction. Samsung publish four words and a generic power cycle, and nothing at all for a pyrolytic door that will not unlock.Related: same brand
- C-d0Get it checkedA button has been pressed and held too long, or something is holding it. Samsung have you clean the buttons and check for water around them.Related: same brand
- S-01Usually simple to fixThe safety shutoff. Samsung state plainly this is not a system failure — the oven ran at temperature for longer than its limit and stopped itself.Related: same brand
- C-F0Get it checkedThe control boards have stopped talking to each other. Three related codes cover the communication and memory faults, all with the same generic remedy.Related: same brand
- Pr EUsually simple to fixNot a fault at all. The oven is preheating, and Pr E clears itself the moment the set temperature is reached. Keep the door shut.Related: same brand
- dCGet it checkedThe divider is in the wrong place for the mode you selected. Dual cook needs it in, single cook needs it out, and the oven will not proceed otherwise.Related: same brand
Own a Samsung oven? Save it and its codes come first next time.
Related guides
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer support portal
- Manufacturer technical and service documentation
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.