Q: Where is the water tank located on the Nilfisk CA 551 scrubber?

The Nilfisk CA 551 scrubber has two distinct tanks: Solution tank (16) : intended for cleaning water with detergent, with a capacity of 58 liters Recovery water tank (17) : collects dirty water after suction, with a capacity of 60 liters Filling the solution tank The tank is filled using the chute (5). Pour in a suitable solution for the task at hand, without filling completely - leave a few centimeters from the edge. The hose (13) at the back serves as a level reference. The water temperature must not exceed 40°C. Important: use only low-foaming, non-flammable liquid detergents. Emptying the tank After use, empty the tank via the flexible hose (13) located at the back of the machine, then rinse it with clean water.

Question 1

Where is the water tank located on the Nilfisk CA 551 scrubber?

Accepted Answer

The Nilfisk CA 551 scrubber has two distinct tanks:

Solution tank (16): intended for cleaning water with detergent, with a capacity of 58 liters
Recovery water tank (17): collects dirty water after suction, with a capacity of 60 liters

Filling the solution tank

The tank is filled using the chute (5). Pour in a suitable solution for the task at hand, without filling completely - leave a few centimeters from the edge. The hose (13) at the back serves as a level reference. The water temperature must not exceed 40°C.

Important: use only low-foaming, non-flammable liquid detergents.

Emptying the tank

After use, empty the tank via the flexible hose (13) located at the back of the machine, then rinse it with clean water.

Question 2

What to do when the red, orange, and green indicators light up simultaneously on the NILFISK SC351?

Accepted Answer

When the three LEDs (indicators) red, orange, and green light up simultaneously and steadily on the handle of the NILFISK SC351 when connecting the battery charger to the electrical network, it indicates a serious problem with the battery. This simultaneous lighting of the 3 indicators is a specific alert signal: the battery is either damaged or excessively discharged beyond normal charging capacities.

Diagnosis: The green indicator normally indicates that the battery is charged and the machine is ready for use. The yellow indicator signals a semi-discharged battery requiring a recharge. The red indicator indicates a completely discharged battery. However, the simultaneous and steady lighting of all three indicators exceeds these normal conditions and reveals a battery malfunction.

Recommended action: In this situation, it is imperative to immediately contact an authorized NILFISK after-sales service. The battery cannot be restored by a simple recharge. The authorized service will either perform a complete restoration of the battery's functionality or replace it entirely if it is too damaged. Do not attempt to continue charging the battery or using the machine in this state, as this could worsen the damage.

Prevention: To avoid this situation, charge the battery regularly when the yellow indicator (semi-discharged battery) is on and never leave the battery in a completely discharged state for long periods. An excessively discharged battery loses its ability to be properly recharged.

Question 3

Why does the red LED on the NILFISK SCRUBTEC 343B scrubber charger never change despite charging?

Accepted Answer

If the red LED on your NILFISK SCRUBTEC 343B scrubber charger remains lit without changing color during charging, it may indicate several situations:

Possible Causes

Defective charger: An internal problem with the charger may prevent the LED from changing state.
Battery issue: The battery may be too discharged, damaged, or at the end of its life, preventing proper charging and the LED from changing.
Poor connection: The charger may not be properly plugged into the electrical outlet or the scrubber.
Insufficient charging time: If the battery is completely discharged, the LED may remain red for some time before changing.

What to do?

Ensure that the charger is properly plugged into a functional electrical outlet and that the connector is correctly inserted into the scrubber.
Visually check that the charger and its cables do not have any visible damage.
Try plugging the charger into another outlet to rule out a power issue.
Allow the battery to charge for at least a few hours, especially if it was completely discharged.
If possible, test the battery with another compatible charger to check if the battery charges correctly.

If after these checks the red LED still does not change, it is likely that the charger or the battery is defective and needs repair or replacement.

Question 4

Why doesn't my NILFISK BR 700S scrubber raise the brushes when I ask it to?

Accepted Answer

Your Nilfisk BR 700S scrubber features a brush lifting system controlled via the OneTouch panel, which centralizes the activation of all cleaning functions. If the brushes do not lift upon request, several elements should be checked as a priority, starting with the most accessible.

Start by checking the battery condition. The BR 700S operates with a 24 V battery that powers the brush lifting system. If the battery is low or poorly charged, the lifting mechanism will not have sufficient power to operate the brushes. Ensure that the battery is fully charged and that the connection terminals are clean and tightly secured. A faulty battery is the most common cause of this issue.

Next, inspect the OneTouch control panel. Press the brush lifting button several times to check that it responds to each press. If the button is stuck, emits no signal, or makes no mechanical noise, the electrical control system is defective and requires repair.

Also check the hydraulic and mechanical system of the brush lifting. The BR 700S uses a mechanism combining hydraulic and mechanical elements to lift the brushes. Look for oil leaks around the lifting system, pinched hoses, or damaged cables. A debris or mechanical blockage may also prevent the brushes from moving fully.

Check the floating system and filters. The technical manual emphasizes that the floating system and filter protect the vacuum unit and ensure optimal airflow. A clogged filter can unbalance the system and indirectly affect the brush lifting by creating abnormal pressure or resistance.

If after these checks the brushes still do not lift, the problem lies within the hydraulic system, position sensors, or control electronics. These internal components require the intervention of a specialized Nilfisk technician for a thorough diagnosis and appropriate repair.

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