The engine control panel making noise when the engine is off is actually the low oil pressure alarm. If you hear it with a engine running you want to attend to it ASAP!
I suspect the alarm the poster is getting is the bilge alarm. When the bilge pump is activated by the float switch it sounds a alarm on most boats. Usually at or near the electrical panel there is a bilge panel that will also activate a light showing which pump is running. When out sailing it’s normal to have a pump cycle on once in a while. If your sitting at a anchorage and a pump is coming on more than once a night you probably have a issue. The first thing to do is inspect the sump where the pump is located. If clear water is present taste it to see if it fresh or salt. In every case I have had on a charter boat the pump cycling on at anchor has been caused by a leak in the fresh water system. A second hint is the freshwater pump cycling on when no one is using water. Best to shut the pump off at night and underway. While sailing its often salt water and usually caused by leaking escape hatches on boats equipped with them.
G