Display shows NO WATER or a similar message shortly after starting a brew, even though the reservoir is filled.

Safety first: Unplug the coffee maker and allow it to cool before troubleshooting.

Clear possible airlock:

• Fill the reservoir completely with water.
• With the unit unplugged, gently tap the sides of the machine near the base to dislodge trapped air bubbles.
• Plug in and start a brew cycle; listen for the sound of water moving through the heater.

Clean inlet and valve:

• Remove the reservoir and inspect the inlet screen or mesh filter at the base. Rinse and brush away any debris.
• Check the one-way valve (often a small rubber or plastic valve at the reservoir outlet or in the inlet port). Ensure it moves freely and is not blocked by scale.

Descale the system:

• Run a vinegar and water descaling cycle (1:1 mix) to dissolve mineral buildup in the heating tube and hoses.

Sensor check:

• If the unit still reports NO WATER immediately, the temperature sensor or control board may be falsely detecting a dry heater.
• Inspect and test the NTC sensor and wiring as described for E1 faults.

When to replace:

• Replace a blocked or damaged one-way inlet valve or inlet screen if cleaning does not restore flow.
• If the sensor is faulty, replace the temperature sensor (NTC) or control PCB as needed.