Multicooker will not start a cooking cycle and displays E1 on the control panel.

Safety first: Unplug the multicooker and allow it to cool completely before opening any panels. Never work on the unit while it is connected to power.

• 1. Power reset: Unplug the Chefman multicooker for 10 minutes, then plug it back in and try a simple cooking mode (e.g., Sauté) to see if E1 clears.
• 2. Check inner pot seating: Remove the inner pot, wipe the bottom dry, and inspect the central metal plate and sensor area in the base for debris or warping. Reseat the pot firmly and retry.
• 3. Inspect bottom sensor wiring (advanced): With the unit unplugged, remove the bottom cover (usually Phillips screws). Locate the small NTC temperature sensor clipped to the underside of the heating plate or in a metal well. Ensure its two-wire connector is firmly plugged into the main PCB and that no wires are broken or pinched.
• 4. Test the sensor (for technicians): Using a multimeter set to resistance, measure the NTC sensor across its two leads. A typical reading is between 50k–100kΩ at room temperature (exact value varies by model). An open circuit (infinite resistance) indicates a failed sensor that must be replaced.
• 5. Replace the sensor if faulty: If the NTC is open or physically damaged, replace it with a compatible Chefman bottom temperature sensor assembly. Reattach it in the same position and ensure good contact with the metal surface.

If E1 persists after confirming wiring and replacing the sensor, the main control board may be defective and should be serviced or replaced by a qualified technician.