F19 displayed; thermostat cannot complete firmware update.

Safety first: Do not remove power during an active firmware update unless instructed by Ideal support.

Steps:

• 1. Ensure stable power and Wi-Fi: Avoid updating during storms or when power is unstable. Place the router close to the thermostat.
• 2. Retry update: From the Ideal app or thermostat menu, attempt the firmware update again. Ensure your phone remains connected and the app stays open if required.
• 3. Factory reset: If F19 persists, perform a factory reset and then retry the update.
• 4. Contact support: If the thermostat is stuck in a boot loop or cannot recover, contact Ideal support. The unit may need to be replaced under warranty.