Thermostat displays 'Low Battery' or app warns of low thermostat battery

Safety first: Battery replacement is safe and user-serviceable.

• Replace all batteries: Remove the thermostat from its wall plate, open the battery compartment, and replace all cells with new, high-quality alkaline batteries of the specified type.
• Avoid mixing batteries: Do not mix old and new batteries or different brands/types, as this can cause rapid drain.
• Clean contacts: If you see white or green corrosion, gently clean the contacts with a dry cloth or a cotton bud lightly moistened with isopropyl alcohol. Allow to dry fully before inserting new batteries.
• Check firmware: Ensure the thermostat firmware is up to date, as some updates improve power management.
• When to call a pro: If batteries drain within days, the thermostat may have an internal short or RF module fault and should be replaced.