Salt spray test why obviously enough water to show low water level

There are three possibilities:

1, the new salt water, from the medicine box to the spray box has a time, warning lights will be extinguished after a while.

2, plus medicine box to the spray box pipe blockage, if so, spray box without salt water. Remove the spray tower to see if there is any water below.

3, the water level sensor is broken. Only to find salt spray test machine manufacturers repair.