Hello there
Sounds like a 'gas sensor' (whatever that is) error. I recommend calling Samsung Support or a qualified Microwave Technician
SMH2117S/XAA Microwave Is Displaying An Error Code
If your microwave is displaying an error code, such as -SE-, E-11, E-12, E-13, or E-14, or any other trouble code not listed here, cycle the power to the microwave by either unplugging the unit, or cycling the circuit breaker for approximately 60 seconds before restoring power.
If the above suggestion does not work,and the error code returns, your microwave will require service.
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