Riello
Cold Weather Fuel / Combustion Issue
Burner lockout occurs mostly in very cold weather, furnace struggles to start
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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
Thickened or gelled heating oil, Partially blocked oil filter, Long or exposed oil line causing waxing, Marginal ignition in low temperatures
How to Fix / Troubleshooting
Safety: Turn off power and fuel before servicing.
Steps:
- Replace filter: Install a new oil filter, as wax can quickly clog elements.
- Check oil line routing: Insulate or reroute exposed lines to reduce cold exposure.
- Use winter-grade fuel: Consult your oil supplier about additives or winter blends.
If lockouts persist, a technician should evaluate pump performance and combustion in cold conditions.
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Repair Difficulty
Medium
3/5
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