Grant
Flue Draft or Wind Interference
Boiler frequently goes to lockout during windy conditions, especially with an external flue.
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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
Incorrect flue terminal location, Wind blowing directly into terminal, Inadequate flue support, Poor combustion setup sensitive to draft changes
How to Fix / Troubleshooting
Safety: Lockouts due to wind usually indicate flame instability; do not bypass safety devices.
User actions:
- Observe whether lockouts coincide with strong winds and inform the engineer.
Engineer actions:
- Review the flue installation against Grant's siting and terminal position guidelines.
- Fit an appropriate terminal guard or deflector if recommended.
- Re-commission the burner to ensure stable combustion across draft variations.
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Repair Difficulty
Hard
4/5
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