A loud rattling FC7 can result from rollers that are too dry or deformed after incorrect storage rather than an internal motor failure. Separate tank seating, liquid flow, suction and brush drive before ordering a part. Empty dirty water, keep electrical areas dry and run only the short test described for this exact model family. What the alert means: Dry roller fibres hit the floor unevenly, and rollers left under load can lose their round profile and create periodic noise. What to distinguish first: Turn each removed roller and look for flat sections; noise that follows roller rotation differs from a constant motor grind. 1. Confirm the exact symptom — Dry roller fibres hit the floor unevenly, and rollers left under load can lose their round profile and create periodic noise. 2. Prepare safely — Switch off, unplug the charger and empty both tanks before removing a roller, filter or floorhead cover. 3. Apply the official check — Moisten clean rollers evenly, reinstall them on the correct sides and store the FC7 on its parking station without loading the rollers. 4. Interpret one retest — Test on smooth hard flooring. Replace verified rollers if flat spots remain; stop for grinding that continues without rollers. The official Kärcher procedure identifies this exact symptom and supports the checks above. Keep the charging port and motor vents dry, and never clear a blockage while the appliance can start. Stop for a damaged tank, battery heat, electrical smell, persistent leak or an error that returns after one clean test.
Models covered
Safety first
- Keep the charging port and motor vents dry, and never clear a blockage while the appliance can start.
What the symptom may indicate
Checks in the right order
- Confirm the exact symptom
Dry roller fibres hit the floor unevenly, and rollers left under load can lose their round profile and create periodic noise.
- Prepare safely
Switch off, unplug the charger and empty both tanks before removing a roller, filter or floorhead cover.
- Apply the official check
Moisten clean rollers evenly, reinstall them on the correct sides and store the FC7 on its parking station without loading the rollers.
- Interpret one retest
Test on smooth hard flooring. Replace verified rollers if flat spots remain; stop for grinding that continues without rollers.
Stop and get qualified help when
- Stop for a damaged tank, battery heat, electrical smell, persistent leak or an error that returns after one clean test.
Next step
Repair, replace a part, or arrange a diagnosis?
Use the checks and stop conditions above to choose a cautious next step. A symptom alone never proves that the appliance has failed.
Resolve it without buying anything
Complete the 4 user-accessible checks in order. If normal operation returns and no warning sign remains, no replacement is indicated.
Replace only the confirmed part
If the checks isolate a worn or blocked component, match its complete reference to the exact appliance model before ordering.
Kärcher Yellow multi-surface FC roller set
Kärcher official yellow multi-surface fc roller set, reference 2.055-006.0. Compatibility is published only for the exact appliance codes explicitly listed by the manufacturer source.
Amazon paid linkArrange a diagnosis before replacing the appliance
Stop at any warning sign listed above. A qualified diagnosis should confirm that repair is unsafe, unavailable or uneconomical before an appliance replacement is considered.
Sources used
- Kärcher — The official Kärcher procedure identifies this exact symptom and supports the checks above.
Last checked: 30 August 2026