This alarm is raised when 2 adjustments have been performed in less than 24 hours.
An adjustment pour around 1gal (4L) in the tank to balance the evaporation, it is performed approximatively once every 2 to 3 months in normal operation.
The water level is monitored by the Water Level Float Switch (WLFS) and the tank is filled by the Solenoid Valve (SV).