Display shows E18; unit may not switch between modes correctly (e.g., Sabbath mode, vacation mode).

Safety first: No internal high-voltage work is required for basic reset. Unplug the unit if removing the control panel.

Steps:

• Attempt a soft reset: Use the front panel buttons to exit any special modes per the user manual (e.g., press and hold specific keys).
• Hard reset: Disconnect power for 5–10 minutes, then restore power and reprogram desired temperatures.
• Button test: If certain buttons do not respond or feel stuck, remove the control panel and inspect the keypad or touch board for contamination or damage.

Corrective action: If the error persists and buttons are unresponsive, replace the user interface / keypad assembly. If a firmware update is available from Viking, it should be performed by an authorized technician.