E5 error appears when trying to start a pressure cooking program; unit may heat briefly but will not proceed to full pressure.

Safety first: Unplug the cooker and ensure there is no residual pressure. Open the lid only after confirming the float valve has dropped and steam has fully vented.

• Clean the pressure path: Remove the steam release valve, anti-block shield, and float valve (if removable). Clean all parts with warm soapy water, rinse, and dry. Use a thin brush or pipe cleaner to clear the steam release channel.
• Locate the pressure sensor port: On many Nesco multicookers, a small port or tube from the lid or inner chamber leads to the pressure sensor. Ensure it is not blocked by food residue or starch. Carefully clear any obstruction.
• Inspect wiring (advanced): With the unit unplugged and covers removed, locate the pressure sensor (usually a small rectangular component on a bracket or PCB with a hose or port). Check that its connector is firmly seated and that the hose (if present) is not kinked or cracked.
• Test with water only: Reassemble all parts, add 2–3 cups of water, and run a short pressure program. If E5 reappears quickly, the pressure sensor itself or the main board may be defective.

Warning: Never poke sharp objects into the pressure sensor port; you can puncture the sensor diaphragm. If cleaning and reseating do not resolve E5, seek professional service.