Following can be the reasons for the Boiler water level to be low -

▪ Evaporation and consumption rate high than feed rate
▪ Cascade tank empty
▪ Defective feed pump
▪ Feed water regulator not functioning properly
▪ Safety valve blowing
▪ Blow down valve leaking
▪ Boiler tubes leaking
▪ One of the gauge glass is defective