Gosund
Unstable Power or Firmware Crash
Thermostat randomly reboots or restarts several times a day
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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
Weak 24VAC supply, Loose C‑wire connection, Overheating main PCB, Firmware bug causing watchdog resets
How to Fix / Troubleshooting
Warning: Turn off power to the HVAC system before touching wiring.
- Step 1 – Check wiring:
- Ensure R and C wires are firmly connected at both thermostat and furnace board.
- Inspect thermostat cable for damage.
- Step 2 – Measure voltage:
- Measure AC voltage between R and C at the thermostat; should be stable around 24VAC.
- Step 3 – Improve ventilation:
- Ensure the thermostat is not covered or blocked; overheating can cause resets.
- Step 4 – Firmware update and reset:
- Update firmware via the Gosund app and perform a factory reset.
- Step 5 – Replace thermostat if reboots persist:
- Persistent random reboots with stable power indicate a failing main PCB; replace the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
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