The alarm on my Incubator keeps beeping code says ALR15 or ALARM 15, what does this mean?

ALR15 or Alarm 15 means Humidity.  You need to check your room humidity and set humidity values on Incubator.  Make sure you have water in the main water tank that flows to the Humisonic reservoir.  If your Humidity is high check the channels you have filled in bottom of Incubator.  Only 1 channel should have water in it.  If you have low humidity you can fill another channel and so on.