Ascaso coffee machine shows E6 and the pump runs but no water exits the group or steam wand.

Basic steps:

• Check water supply: Ensure the tank is full and properly seated. Clean any mesh filter at the tank outlet.
• Prime the pump: With the machine on and the brew switch activated, open the steam valve fully. Sometimes water will start flowing through the steam wand first, clearing the airlock.

If no improvement (unplug before further work):

• Inspect inlet hose: Remove the tank and check the silicone hose from tank to pump for kinks, cracks, or blockages. Replace if hardened or collapsed.
• Check pump and check valve: Access the vibration pump. Remove the inlet and outlet hoses and verify that water can be drawn through the pump manually (using a syringe) and that the check valve is not stuck.
• Descale the hydraulic circuit: If scale is suspected, run a descaling solution through the system according to Ascaso instructions, focusing on the pump, boiler, and group passages.
• Replace the pump: If the pump is noisy but cannot build flow even after priming and descaling, replace the vibration pump assembly.

Note: After replacing the pump, always prime it with water before running it dry to avoid damage.