Thermostat shows E14 and the display is frozen or unresponsive to touch/buttons

Safety first: The thermostat is low voltage. Avoid using sharp tools on the display.

• Soft reset: Remove the thermostat from its wall plate or remove batteries for 30–60 seconds, then refit.
• Clean the surface: Wipe the display with a soft, dry cloth to remove moisture or dirt that may affect touch sensitivity.
• Check for physical damage: Inspect for cracks or signs of impact. If the glass is damaged, do not press hard on the screen.
• Update firmware: Use the Wiser app to check for updates that may address UI stability.
• If E14 remains and controls are unusable: Replace the thermostat, as the touch panel or UI controller is likely defective.