What does the red droplet light on the NILFISK SCRUBTEC 553E scrubber mean and how can it be resolved?

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The red droplet light on your NILFISK SCRUBTEC 553E scrubber is a water system alert indicator. This light comes on when there is a problem affecting the supply of clean water or the suction of dirty water, preventing the machine from operating correctly.

The most common causes of this indicator are: the clean water tank (20 liters) being empty or nearly empty, disconnected or blocked water supply hoses, or clogged clean water filters (51) that prevent water flow. It may also be due to the recovery water tank (40 liters) being full and blocking the suction system.

Steps to resolve the issue: Start by checking and filling the clean water tank (20) using the funnel (37) with clean water at less than 40°C, without exceeding a few centimeters from the edge. Then open the lid (22) and empty the recovery water tank (21) using the drain hose (16) if it is full. Inspect all water supply hoses to ensure they are properly connected and leak-free, especially the flexible hose (15) and the level hose (9).

Clean the clean water filter (51): remove the tank (20) and access the filter to rinse it with clean water. Also check the suction grid (36) with the automatic float to ensure it is not blocked, as if the float is in the closed position, the recovery water will not drain properly. After these checks, securely close the lid (22) and ensure that the sealing gasket (31) is in good condition and properly in place.

Restart the machine by turning the ignition key (80) to the 0 position for a few seconds, then start it normally. The light should turn off once the problem is resolved. If the red droplet light persists after these checks, it may indicate a more serious issue with the distribution pump (water solenoid) or other components of the hydraulic system. In this case, contact the authorized NILFISK after-sales service for a thorough diagnosis.

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