Thermostat displays E14 and shows battery icon flashing (for battery-powered models); device may turn off unexpectedly

Safety: Use only recommended battery types. Do not mix old and new batteries.

• Step 1 – Replace batteries: Open the battery compartment and replace all batteries with new, high-quality alkaline cells of the specified type (e.g., AA or AAA).
• Step 2 – Clean contacts: If there is white or green corrosion, gently clean the contacts with a cotton swab and a small amount of isopropyl alcohol. Allow to dry fully.
• Step 3 – Check orientation: Ensure batteries are inserted with correct polarity as indicated in the compartment.
• Step 4 – Test operation: Refit the thermostat and check if E14 disappears and the device remains powered.
• Step 5 – Internal fault: If new batteries drain very quickly or E14 persists, the internal power circuitry is likely defective and the thermostat should be replaced.