Safety first: Unplug the cooker and discharge capacitors before touching the PCB. This repair involves live-voltage circuitry.

Listen for relay click: Start a heating program and listen closely. If there is no click from the relay when heating should start, the relay or its drive circuit may be faulty.
Check heater voltage (advanced): With proper isolation and safety precautions, measure AC voltage at the heating element terminals when a program is running. No voltage indicates a switching fault.
Inspect relay/triac: Remove the PCB and visually inspect the heater relay or triac for burn marks or cracked solder joints. Resolder any cracked joints.
Replace switching component: If the relay or triac is visibly damaged or tests faulty, replace it with an identical rated component, or replace the entire main PCB if individual component replacement is not practical.
Re-test: Reassemble and run a water-only heating test to confirm proper operation.

E16 is displayed and the cooker does not heat, although the display and buttons work normally.

Possible Causes