Thermostat shows E13 and indicates an internal memory or configuration error; settings may reset unexpectedly.

Safety first: No high-voltage work is required, but avoid opening the thermostat beyond normal removal from the wall plate.

Steps to troubleshoot:

• 1. Soft reset: Use the thermostat menu to perform a soft reset or reboot. Observe if E13 returns.
• 2. Factory reset: Back up any custom schedules or settings, then perform a factory reset from the installer or advanced menu. Reconfigure the system type and preferences.
• 3. Firmware update: Connect the thermostat to Wi‑Fi and check for firmware updates. Apply any available updates, ensuring power is not interrupted during the process.
• 4. Monitor operation: If E13 does not return after reset and update, continue normal use. If it recurs, the internal memory is likely failing.
• 5. Replacement: Internal memory components are not serviceable. Replace the Bryant smart thermostat if E13 persists.