What to do if my Kärcher Pressure Washer shows ERROR 4 Water shortage?
- Cchristopher73Aug 18, 2025
If your Kärcher Pressure Washer displays ERROR 4 indicating a water shortage, several factors could be the cause. If using an external water supply, check the water inlet pressure. For internal water supply, ensure the water tanks are full. Other potential issues include a defective water shortage safeguard in the float container (replace it), a soiled water filter (clean it), a leaky or kinked water hose (replace it), a soiled float valve in the float container (clean it), or a jammed or defective float valve (repair or replace it).









