Microwave shows E14 and will not start; interior light may come on but no further operation.

Safety first: This is a control-level issue; no internal high-voltage work is required.

Steps:

• 1. Try unlocking: On most MasterChef models, press and hold the STOP/CLEAR or a dedicated LOCK key for 3–5 seconds until the lock icon disappears. Refer to your user manual for the exact combination.
• 2. Power reset: Unplug the microwave for 5 minutes, then plug back in and attempt to unlock again.
• 3. Check keypad response: If some keys work but the lock/unlock key does not, the keypad membrane may be failing.

Next steps: If E14 remains and the lock cannot be cleared, the membrane keypad or control board will likely need replacement.