Error code · Microwave

Samsung Microwave Code C-20: Temperature Sensor

Medium · inspection needed

Code: C-20 / C-21 / C-22
Appliance: Microwave
Brand: Samsung
Warranty: 30-day workmanship

What C-20 / C-21 / C-22 means

C-20, C-21, and C-22 appear on Samsung microwaves and are listed as an error with the temperature sensor. The microwave cannot read its internal temperature correctly, so it stops and shows the code. We describe it by product type because the listing covers Samsung microwaves generally. The same characters can mean a general sensor malfunction on some Samsung ranges and ovens, so this reading applies to microwaves only.

Common causes of C-20 / C-21 / C-22

The temperature sensor reading outside its normal range
Moisture in the cavity or at the sensor connection
A loose connection between the sensor and the control

✓ One safe check you can try

1. Disconnect power by unplugging the microwave or switching off its breaker. 2. If you think moisture got in, let it dry out before powering it back on. 3. If not, wait 60 seconds and then restore power. 4. A second appearance of the code means you should stop and request service.

! Why to stop there

A single clean restart does not prove the sensor reads correctly, only that it did once.
We check the sensor, its wiring, and the reading the control receives.
You get a written price first and a 30-day workmanship warranty.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Microwave codes

E-52Samsung Microwave Code E-52: Memory Circuit Shorted E-53Samsung Microwave Code E-53: Memory Read or Write Failed E-54Samsung Microwave Code E-54: Zero Reading E-61Samsung Microwave Code E-61: Humidity Sensor Open E-62Samsung Microwave Code E-62: Humidity Sensor Shorted E-63Samsung Microwave Code E-63: Humidity Sensor Timed Out E-71Samsung Microwave Code E-71: Steam Sensor Open E-72Samsung Microwave Code E-72: Steam Sensor Shorted

C-20 / C-21 / C-22C-20 / C-21 / C-22 questions

What is the C-20 message about?

It is listed as an error with the temperature sensor. The microwave cannot read its own temperature correctly, so it stops the cooking and shows the code until the sensor reading is sorted out.

Does C-20 mean the same on my Samsung range?

Not necessarily. Ranges and ovens can use the same characters for a general sensor malfunction, which is a different meaning. Our reading here is for microwaves only, so check which appliance you have.

Should I keep trying to start the microwave?

One restart after a power-off is fine. If the code keeps returning, stop using it. The microwave cannot manage heat safely without a good temperature reading, and we test the sensor.

Book a visit

Still seeing C-20 / C-21 / C-22?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 561-5298