E4 error appears, often when using pressure or high-heat modes; cooker may not pressurize or may shut down early.

Safety: If the cooker is hot, do not open the lid until all pressure is released. Keep hands away from steam vents.

Step 1 – Release pressure safely:

• Turn the steam release knob to the venting position (if your Klarstein model has one) and allow all steam to escape.
• Wait until the float valve drops and the lid unlocks.

Step 2 – Clean pressure components:

• Remove the steam release valve cap and wash it under warm water. Clear any food particles or starch.
• Remove and clean the anti-block shield or metal cap over the steam outlet inside the lid.
• Check the float valve and its silicone gasket for sticking or residue; clean and ensure it moves freely.

Step 3 – Inspect pressure sensor:

• On many Klarstein multicookers, the pressure sensor is mounted under the lid or on the top of the housing, connected to the steam chamber via a small tube.
• Unplug the unit, remove the top cover, and locate the sensor (small round or rectangular device with two wires and sometimes a silicone tube).
• Ensure the tube is not kinked, blocked, or detached.

Step 4 – Repair:

• Replace clogged or damaged steam release valve and float valve gaskets.
• If the pressure sensor shows physical damage or E4 persists after cleaning, replace the pressure sensor assembly.
• If replacing the sensor does not resolve the issue, the main control board may be misreading pressure and should be checked by a technician.