Display shows ERR when setting temperature or time; oven may not start.

Safety First: This is usually a user input or keypad issue; no internal access is required initially.

Step-by-step:

• Clear and retry: Press Cancel to clear ERR. Then carefully follow the user manual sequence (e.g., press Bake, set temperature, then press Start).
• Check for stuck keys: Press each key individually and ensure it returns fully. Clean the keypad surface with a damp cloth and dry thoroughly.
• Power reset: Turn off power for 1 minute, then restore and test again.
• Hardware check: If ERR appears whenever a specific key is used, the keypad membrane is likely failing. Replace the touchpad/control panel assembly.