Thermostat shows E16 and indicates internal clock or schedule error; schedules may not run

Safety first: No electrical work is required.

Steps to address E16 clock error:

• 1. Manually set time: From the thermostat settings, manually set the correct date and time. Save and observe whether the time holds after a power cycle.
• 2. Enable network time: If the thermostat is Wi‑Fi capable, ensure it is connected to the internet and configured to sync time automatically.
• 3. Clear and recreate schedules: Delete all existing schedules and recreate them from scratch, either on the thermostat or via the Goodman app.
• 4. Factory reset: Perform a factory reset if the time continues to drift or E16 persists, then reconfigure the system and schedules.
• 5. Replace thermostat: If the internal clock cannot maintain accurate time even with power and network sync, the RTC hardware may be defective and the thermostat should be replaced.