C-A2 — Functional Error

Samsung groups C-A2 (along with C-A0 and C-A1) under 'Functional Error' — the control detected that one of the microwave's monitored internal functions failed its check. Samsung's published code list does not break out which specific function trips C-A2 versus its C-A0/C-A1 siblings; a sibling code in the same family, C-A1, is documented as the vent damper failing to open or close within its expected time. It is NOT a humidity/steam sensor short — humidity or steam sensor faults are the separate C-70 series (steam sensor) and C-10/C-11/C-12 (gas/easy/PH sensor) codes.

A monitored function failed its self-check: Samsung's public documentation lists C-A2 as a generic 'Functional Error' without naming the specific failed check; it is not tied to a documented single component the way some other codes are. Vent damper not confirming open/closed (family-related): The sibling code C-A1 in this same family is documented as the vent damper not confirming its position in time — worth inspecting since it's in the same functional-error group, though Samsung does not document this as C-A2's specific trigger.

Yes, with caution. This is rated a moderate-severity fault.

Unplug the microwave for 5 minutes, then power back on and retest. Check the vent/damper area at the top of the unit for anything blocking movement, since a related function in this code family involves the vent damper. Note whether any other code appears alongside or after C-A2 — that can narrow down which function is failing.