Machine displays E1 and will not start brewing; sometimes accompanied by a brief pump noise and then shutdown.

Safety first: Unplug the coffee maker from the mains before opening any panels. Allow the boiler/thermoblock to cool for at least 30 minutes.

Step-by-step checks:

• Check water tank and seating: Remove the water tank, rinse it, and make sure it is filled above the minimum mark. Inspect the tank outlet valve and rubber seal for debris or scale. Reseat the tank firmly so the valve pin is fully depressed.
• Clean inlet filter: At the machine-side water tank connector, inspect the small mesh filter. If clogged with limescale or coffee dust, clean it with a soft brush and warm water. Do not use sharp tools that can tear the mesh.
• Inspect inlet hose: Remove the rear or side cover (on many Gorenje models, a few Torx screws hold the housing). Trace the silicone hose from the tank connector to the flow meter. Straighten any kinks and check for visible blockages or pinched sections.
• Check flow meter: The flow meter is a small plastic disc with two hose connections and a wire harness. Ensure the connectors are fully seated on the PCB. If the impeller inside does not spin freely when you gently blow through it (with hoses removed), it may be scaled up and require replacement.
• Test inlet valve (if fitted): Some Gorenje espresso machines use a small 230V AC or 24V DC solenoid valve before the flow meter. Check for loose wiring and signs of burning. If the valve does not click when the machine tries to fill (with covers on and machine powered, only for qualified persons), it may be defective.

When to stop: If E1 persists after cleaning the tank connector and hoses, or if you are not comfortable opening the housing, contact a qualified technician. Water and mains voltage are a dangerous combination.