Furnace locks out with E07, often accompanied by a strong draft or wind noise in the vent system.

Safety: Flue gas issues can cause carbon monoxide buildup. If CO alarms sound or you feel dizzy or nauseous, evacuate and call emergency services.

Steps:

• Inspect exterior termination: Check the flue outlet outside for obstructions (ice, snow, nests, debris). Clear any blockage.
• Check condensate drainage: On condensing Atlantic furnaces, ensure the condensate trap and drain line are not clogged. A backed-up trap can flood the inducer or flue collector.
• Examine flue routing: Verify that the flue pipes are properly supported, sloped per Atlantic installation instructions, and have no sags where water can collect.
• Flue sensor reset: Some models have a manual-reset flue temperature limit. After the furnace cools, press the reset button if present. If it trips again, do not continue resetting; the root cause must be corrected.

Recommendation: Vent sizing and combustion analysis should be performed by a qualified technician familiar with Atlantic furnace venting requirements.