Dishwasher does not fill properly and shows E03 on the display.

Safety first: Turn off power and close the water supply tap before working on the inlet system.

E03 indicates the control is not detecting the expected water flow during filling.

• Step 1 – Check water supply:
  • Ensure the household water tap to the dishwasher is fully open.
  • Disconnect the inlet hose from the tap and clean the small mesh filter inside the hose end.
  • Check for kinks or crushing along the entire length of the hose.
• Step 2 – AquaStop and flow meter:
  • Many Siemens dishwashers use an AquaStop hose with integrated valve and flow meter.
  • Inspect the AquaStop housing for damage or signs of leakage.
  • If the AquaStop is buzzing but no water flows, the internal valve may be blocked or defective.
• Step 3 – Internal water path:
  • Remove the left side panel to access the water matrix / heat exchanger and flow meter (on many models).
  • Check for heavy limescale or debris in the water matrix channels.
  • Rinse the matrix with warm water and a descaling solution if heavily scaled (do not damage seals).
• Step 4 – Flow meter test:
  • Inspect the small flow meter (often a reed switch with a rotating wheel) for free movement.
  • If the wheel is stuck, clean it gently.
  • If the reed switch is defective, replace the flow meter assembly.
• Step 5 – Replacement:
  • If the AquaStop valve does not open at all, replace the complete AquaStop inlet hose with the correct Siemens part.

After reassembly, run a test cycle and monitor filling. If E03 persists, the control board input for the flow meter may be faulty.