This system is used to ensure with absolute certainty that the level in the boiler does not exceed the maximum water level allowed avoiding the flooding of the same.
If the water in the boiler above the maximum level of security does intervene the probe that, through his level regulator, temporarily blocks operation of the burner with consequent visual and acoustic alarm.
The reset of the operation of the boiler will happens only after the manual reset and elimination of the error by the operator.