Display shows E13, chemical dosing system (if equipped) does not operate

Safety first: Wear gloves and eye protection when handling concentrated chemicals. Disconnect power before servicing the dosing system.

• Check chemical supply: Ensure the Nilfisk chemical cartridge or tank is not empty and is correctly installed.
• Inspect dosing lines: Follow the small‑bore tubing from the chemical tank to the dosing pump and injection point. Look for kinks, blockages, or crystallized chemical. Flush lines with warm water if compatible with the chemical used.
• Test dosing pump: Disconnect the pump and measure resistance across its terminals. If open or shorted, replace the chemical dosing pump.
• Check level sensor: If the system uses a level sensor in the chemical tank, clean and test it as per the service manual. Replace the chemical level sensor if it falsely reports empty.