the tank alarm is designed to go off only if one of two conditions occur:
1 - The tank is to full due to
blockage or failed pump.
2 - The tank is to empty due to failed float or pump
Silencing the alarm by pressing the red button is the first step once its gone off.
Next, the tank lids need to be removed so the cause can be determined. Many times
the alarm will randomly go off after the tank has been pumped. This is normal since
the float's level has been altered by a source besides its own pump & is not necessarily
a sign of failure