Display shows ERR when attempting to set temperature or timer, oven will not start.

Safety first: No high-voltage work is required for basic troubleshooting.

• Clear entry: Press CLEAR/OFF and re-enter the desired function following the sequence in the Summit user manual.
• Power cycle: Turn the breaker off for 1 minute, then restore power to reset the control logic.
• Check keypad: Press each key individually and confirm it responds. If some keys do not respond or trigger ERR, the keypad/touch panel is likely faulty and should be replaced.
• Control replacement: If a new keypad does not resolve ERR, replace the electronic oven control board.