For Kärcher FC 5 Cordless and FC 7, “Will not switch on while the charging cable is connected” is a distinct manufacturer-documented diagnostic intent. This page preserves the exact code or light pattern, groups every applicable catalog model and limits action to the official safe user check. Kärcher's official material anchors this branch with the exact wording “Operation is not possible while the charging cable is plugged in.”. That wording identifies the documented condition; it does not by itself prove that a battery, motor, board, sensor, dock or other replaceable component has failed. Keep “Will not switch on while the charging cable is connected” separate from every other alert on the same appliance. Match the full number, colour, flash order, spoken phrase or display text before acting; a different pattern owns a different diagnosis and may have a different stop condition. This is an operating interlock, not a failed motor. Switch off, disconnect the charger from the cleaner, move the cable clear of wet floors, confirm useful battery charge and then press the power control once. If the exact “Will not switch on while the charging cable is connected” condition clears and the appliance completes one normal start, charge or cleaning cycle, stop the test and monitor it. If it returns unchanged, do not repeat resets or infer a part: record the code, model and serial number for authorised Kärcher support. Switch off and unplug or undock the cleaner before opening a tank, cover or brush area. Wipe spills at once, keep liquids away from charging contacts and never run the machine with a safety cover removed.
Models covered
- Kärcher FC 5 Cordless · FC 5 Cordless
- Kärcher FC 7 1.055-704.0 · 1.055-704.0
- Kärcher FC 7 Cordless · FC 7 Cordless
- Kärcher FC 7 Cordless Premium KNA · FC 7 Cordless Premium KNA
Safety first
- Switch off and unplug or undock the cleaner before opening a tank, cover or brush area. Wipe spills at once, keep liquids away from charging contacts and never run the machine with a safety cover removed.
What the symptom may indicate
Checks in the right order
- Confirm the exact code or pattern
For Kärcher FC 5 Cordless and FC 7, “Will not switch on while the charging cable is connected” is a distinct manufacturer-documented diagnostic intent. This page preserves the exact code or light pattern, groups every applicable catalog model and limits action to the official safe user check.
- Make the appliance safe
Switch off and unplug or undock the cleaner before opening a tank, cover or brush area. Wipe spills at once, keep liquids away from charging contacts and never run the machine with a safety cover removed.
- Perform the official user check
This is an operating interlock, not a failed motor. Switch off, disconnect the charger from the cleaner, move the cable clear of wet floors, confirm useful battery charge and then press the power control once.
- Retest once and decide
If the exact “Will not switch on while the charging cable is connected” condition clears and the appliance completes one normal start, charge or cleaning cycle, stop the test and monitor it. If it returns unchanged, do not repeat resets or infer a part: record the code, model and serial number for authorised Kärcher support.
Stop and get qualified help when
- Stop immediately for liquid near a plug, charger or battery, a tank or body leak, burning smell, smoke, hot cable, damaged cover, uncontrolled brush movement, or the same alert after the one documented test. Use authorised service. If the exact “Will not switch on while the charging cable is connected” condition clears and the appliance completes one normal start, charge or cleaning cycle, stop the test and monitor it. If it returns unchanged, do not repeat resets or infer a part: record the code, model and serial number for authorised Kärcher support.
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.
This guide does not identify a replacement part. Do not order a generic component from the symptom alone.
Arrange 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 — Kärcher's official FC 7 troubleshooting for Kärcher FC 5 Cordless and FC 7 states exactly: “Operation is not possible while the charging cable is plugged in.” This short quotation is the source anchor for this intent.
Last checked: 30 August 2026