Power Intolerant System Sensor MA-1224

My system sensor mass does this upon being plugged in:

So it makes noise before you pull the pull station?

Bad diode? Meter voltage at the input in standby and alarm. Observe polarity.

Yes, yes it does do that

Do you have another alarm? If so, try putting it in place of the MA horn without changing any other wiring and see if it works correctly. If so, then the problem is definitely in your MA horn.

I had the problem before when I was decibel testing the alarms, none of them did this other than the MA-1224

Like @mikedice711 said, it may be a bad diode in the device. Unfortunately it may be an internal issue that cannot be fixed.

Welp, that lasted a while