10
Vokera
Flue Gas Overheat / Flue Thermostat Trip
Code 10, furnace does not start, fan may run briefly then stop
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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
Blocked flue, Failed flue thermostat, Fan speed too low, Heat exchanger partially blocked
How to Fix / Troubleshooting
Safety: Turn off power and allow the unit to cool. Do not operate the furnace with a suspected flue blockage.
- Check flue terminal: Outside, ensure the Vokera flue outlet is clear of obstructions (snow, nests, debris). Maintain required clearances from walls and structures.
- Inspect fan and flue path: With the casing removed (qualified persons), check that the fan and flue hood are free from soot or debris.
- Reset flue thermostat: Some models have a manual reset flue thermostat on the flue hood. Once cool, press the reset button if accessible. If it trips again, do not continue resetting.
- Call a professional: A gas-safe technician must check combustion, flue integrity, and heat exchanger cleanliness.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Overheat Thermostat
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