Machine displays ER04 and stops brewing or heating

Safety: Unplug the machine before moving or tilting it.

• Check water tank and filter:
  • Remove and thoroughly rinse the water tank.
  • Ensure the Sage water filter (if fitted) is not clogged; try running the machine briefly without the filter installed.
  • Make sure the tank is fully seated and the float moves freely.
• Clear airlocks:
  • Fill the tank completely.
  • With the machine on, run the hot water function (if available) until a steady stream appears. This can purge air from the system.
• Descale: Run a full descale cycle to clear limescale from the flow meter and inlet lines.
• Internal check (advanced):
  • Access the flow meter (usually located between the water tank outlet and the pump).
  • Inspect for kinks in hoses or visible scale buildup.
  • Check the electrical connector from the flow meter to the main PCB.
• Repair: If the flow meter is seized or its sensor has failed, replace the flow meter assembly. Ensure correct orientation of inlet/outlet arrows.
• Service: If ER04 persists after descaling and tank checks, professional diagnosis is recommended.