F.16
Glow-worm
Firmware Update Failure
Thermostat shows F.16 and cannot complete firmware update
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Interrupted update due to power loss, Corrupted firmware image downloaded via Wi‑Fi, Insufficient internal memory, Faulty flash memory sector
How to Fix / Troubleshooting
Safety: No mains work is required. Do not power off the thermostat during any retry of the update unless instructed.
Steps:
- Ensure the thermostat has a stable power source and strong Wi‑Fi connection.
- From the app or thermostat menu, retry the firmware update, following Glow‑worm’s instructions carefully.
- If possible, move the thermostat closer to the router during the update to reduce the chance of packet loss.
- If the update fails repeatedly at the same point, check Glow‑worm support for any known issues with that firmware version.
Remedy:
- If the thermostat is stuck in a bootloader or recovery mode and cannot complete the update, it may require replacement or service‑level re‑flashing by Glow‑worm.
- Do not attempt to load unofficial firmware; this can permanently damage the device and void warranty.
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Repair Difficulty
Medium
3/5
Required Part
Glow-worm smart thermostat firmware / main PCB
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