I simply desoldered the buzzer. I think the problem is in some of the sensors, because the thermostat for the fridge part shows an error instead of letting me adjust the temperature (but I’m guessing it’s still falling back somewhere within the adjustable range). I’m positive that the light turns off on a closed door, I can hear the relay switching it off and I can see the light coming on with a delay (like it normally does) after opening the door.