Thermostat displays E17 and indicates a firmware update failure.

Safety first: Do not cut power during any firmware recovery process unless instructed by Goodman support.

Steps to resolve E17 firmware error:

• 1. Ensure stable power: Confirm the HVAC breakers are on and the thermostat has a solid 24VAC supply. Avoid resetting breakers during recovery.
• 2. Improve Wi-Fi signal: Move the router closer or use a Wi-Fi extender to ensure a strong signal at the thermostat location.
• 3. Retry update: From the thermostat or app, attempt the firmware update again. Allow extra time for the process to complete.
• 4. Factory reset: If the thermostat boots but E17 persists, perform a factory reset and then retry the update.
• 5. Contact support: If the thermostat is stuck on a bootloader or recovery screen, contact Goodman technical support for model-specific recovery steps. In many cases, replacement is required.