Display shows ERR3 and the coffee maker stops mid-brew or never starts brewing.

Safety first: Unplug the coffee maker and let it cool completely before working on it.

Descale to clear blockages:

• Fill the water reservoir with a 1:1 mixture of white vinegar and water.
• Run a brew cycle without coffee grounds. If the unit allows, run multiple short cycles to move the solution through the internal tubing and flow meter.
• Let the machine sit for 20–30 minutes, then run several full reservoirs of clean water to flush out vinegar and loosened scale.

Check water supply path:

• Ensure the reservoir outlet valve at the bottom is not blocked by debris or scale.
• Inspect the inlet screen (if present) for sediment and rinse thoroughly.

If ERR3 persists:

• The internal flow meter assembly may be stuck or failed. Access usually requires removing the top or back cover.
• Inspect the small plastic flow meter (often a round or oval component in the water line) for kinks in hoses or visible cracks.
• Replace the flow meter if the turbine does not spin freely or if the sensor is open-circuit.

Because accessing the flow meter involves opening the appliance and dealing with hot-water tubing, consider a professional technician if you are not comfortable with internal repairs.