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Weather-Related Venting / Combustion Issues
Furnace intermittently fails to start on very cold or very windy days.
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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
Wind-induced downdraft in vent, frost or ice blocking intake/exhaust, marginal pressure switch operation, inadequate combustion air
How to Fix / Troubleshooting
Safety first: Do not modify vent terminations without following manufacturer guidelines.
- Inspect terminations: Check for frost, ice, or snow buildup around intake and exhaust pipes and clear them.
- Wind shielding: If wind is blowing directly into the vent, consult installation instructions about approved vent termination kits or wind guards.
- Combustion air: Ensure the furnace room has adequate openings for combustion air if not direct-vented.
If problems persist only in extreme weather, a technician should evaluate vent design and pressure switch margins.
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Repair Difficulty
Medium
3/5
Required Part
Vent Termination Kit
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