Einführung
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Karcher Electronic Pressure Switch 6.997-357.0. This device is designed to automatically control the operation of a pump, providing dry-run protection to prevent damage.
The electronic pressure switch automatically switches the pump on and off based on water demand, making it ideal for converting a standard garden pump into an electronic booster pump. Its integrated dry-run protection feature safeguards the pump by automatically shutting it off if no water is detected on the suction side.
Sicherheitshinweise
Please read and understand all safety instructions before installing or operating the device. Failure to follow these instructions may result in electric shock, fire, serious injury, or property damage.
- Elektrische Sicherheit: Always disconnect power before performing any installation, maintenance, or repair work. Ensure all electrical connections are made by a qualified electrician and comply with local regulations.
- Wasserdruck: Ensure the system's water pressure does not exceed the maximum operating pressure of the device or connected pump.
- Installationsumgebung: Install the device in a location protected from freezing temperatures, direct sunlight, and excessive moisture.
- Verwendungszweck: Use this device only for its intended purpose as an electronic pressure switch with dry-run protection for pumps. Do not modify the device.
- Kinder und unbefugtes Personal: Halten Sie Kinder und unbefugte Personen während des Betriebs vom Gerät fern.
Packungsinhalt
Prüfen Sie beim Auspacken, ob alle Komponenten vorhanden und unbeschädigt sind.
- Karcher Electronic Pressure Switch with Dry Run Protection (Model 6.997-357.0)
- Benutzerhandbuch (dieses Dokument)
Setup und Installation
Proper installation is crucial for the correct function and longevity of the electronic pressure switch.
1. Montage des Gerätes
The pressure switch should be installed vertically, with the water inlet at the bottom and the outlet at the top, to ensure proper air bleeding and sensor function. Securely mount the device to a stable surface using appropriate fasteners (not included).
2. Wasseranschlüsse
Connect the pump's discharge outlet to the inlet of the pressure switch. Connect the water supply line to the outlet of the pressure switch. Ensure all connections are watertight using thread sealant tape or appropriate gaskets. Avoid overtightening connections.

Bild 1: Seite view of the Karcher Electronic Pressure Switch, showing the pressure gauge and threaded inlet/outlet connections. The gauge displays pressure in bar and psi.
3. Elektrische Anschlüsse
Connect the power supply to the pressure switch and the pressure switch to the pump's power input. Refer to the wiring diagram provided with your pump and the pressure switch for specific connections. Ensure all electrical connections are secure and protected from moisture.
Wichtig: This device operates on 12 Volts (DC). Verify compatibility with your pump and power supply before connecting.
Bedienungsanleitung
The Karcher Electronic Pressure Switch is designed for automatic operation.
Automatischer Betrieb
Once installed and powered, the device will automatically switch the connected pump on when water demand is detected (e.g., opening a tap) and switch it off when water flow stops. The integrated pressure gauge provides a visual indication of the system pressure.
Trockenlaufschutz
If the pump runs without water on the suction side, the dry-run protection feature will automatically shut off the pump to prevent damage. This is indicated by a specific light on the control panel.

Bild 2: Front view of the Karcher Electronic Pressure Switch, showing the power indicator, fault indicator, and the 'RESET' button.
Zurücksetzen des Geräts
If the dry-run protection activates, the pump will stop, and a fault indicator light will illuminate. To reset the device and restart the pump, ensure there is water available on the suction side, then press the ZURÜCKSETZEN button located on the front panel (refer to Image 2).
Wartung
Regular maintenance ensures optimal performance and extends the lifespan of your pressure switch.
- Reinigung: Periodically clean the exterior of the device with a damp Tuch. Verwenden Sie keine scharfen Chemikalien oder Scheuermittel.
- Verbindungsprüfungen: Regularly inspect all water and electrical connections for leaks or corrosion. Tighten connections as necessary.
- Überwinterung: In areas prone to freezing temperatures, disconnect and drain the device and connected pump to prevent damage from ice expansion. Store in a dry, frost-free location.
Fehlerbehebung
In der folgenden Tabelle finden Sie häufig auftretende Probleme und deren Lösungen.
| Problem | Mögliche Ursache | Lösung |
|---|---|---|
| Pumpe startet nicht. | Keine Stromversorgung. Dry-run protection activated. Fehlfunktion der Pumpe. | Stromanschluss prüfen. Ensure water supply, then press ZURÜCKSETZEN. Inspect pump for issues. |
| Pumpe läuft dauernd. | Leck im System. Konstanter Wasserbedarf. | Check all connections and pipes for leaks. Ensure all taps are closed. |
| Dry-run protection activates frequently. | Unzureichende Wasserversorgung. Air in the suction line. | Verify water source and supply. Bleed air from the pump and suction line. |
| Aus den Anschlüssen tritt Wasser aus. | Lose Verbindungen. Damaged seals/thread tape. | Tighten connections. Apply new thread sealant tape or replace gaskets. |
If the problem persists after attempting these solutions, please contact Karcher customer support.
Technische Daten
| Marke | Karcher |
| Modellnummer | 6.997-357.0 |
| Bandtage | 12 Volt (DC) |
| Artikelgewicht | 0.96 Kilogramm (2.11 Pfund) |
| Material | One or more values from [Metal, Steel, Rubber, Ethylene Propylene Diene Monomer, Acrylonitrile Butadiene Styrene, Brass, Iron, Plastic, Copper, Bronze, Polyvinyl Chloride, Polyoxymethylene] |
| Technische Daten | 53.15"L x 39.37"W x 74.8"H (Note: These dimensions appear to be for a larger product, possibly a pressure washer, not the switch itself. Please refer to product packaging for accurate switch dimensions.) |
| Im Lieferumfang enthaltene Komponenten | Kärcher Electronic pressure switch with dry run protection |
| GTIN | 04039784223240 |
Hinweis: Technische Daten können ohne vorherige Ankündigung geändert werden.
Garantie und Support
For warranty information, technical support, or to purchase replacement parts, please contact Karcher customer service. Refer to your product packaging or the official Karcher website for the most up-to-date contact details and warranty terms applicable to your region.
Online-Ressourcen: www.kärcher.com





