Washer displays E16; door will not unlock at end of cycle, or unlocks unexpectedly mid-cycle.

Safety first: Unplug the washer. If the drum is full of hot water, allow it to cool before attempting manual door release.

Step-by-step checks:

• Manual release: Many Grundig models have a manual door release tab accessible through the pump filter area. Consult your user manual and gently pull the tab to open the door.
• Inspect door lock: Remove the door lock assembly and check for mechanical sticking or heat damage. If the latch does not move freely, replace the lock.
• Test lock coil and contacts: Measure coil resistance and check continuity of the lock's internal switch when engaged. Replace the lock if readings are out of spec.
• Control board: If a new lock does not resolve E16, the PCB may be misdriving the lock. Replacement of the main control board may be required.