Error code
E-21
Meaning
Temperature sensor circuit is broken open
Moderate
What to do
Why this happens
Possible causes include a disconnected sensor harness, an improperly inserted connector on either CN201 or CN02 PCBs, an oven sensor with an internal open circuit, or damage to the sensor harness or terminal.
How to fix it
Replace sensor if resistance too high; check harness connection and repair if damaged
SourceSamsung service manual