Furnace starts normally but shuts off on very cold or very windy days.

Safety: Repeated shutdowns in extreme weather can indicate unsafe venting. Address promptly.

• Step 1 – Inspect vent terminations: Check outside for snow, ice, or wind-driven debris blocking the intake or exhaust. Clear and maintain proper clearances.
• Step 2 – Add wind protection: Consult a professional about adding approved vent terminations or wind hoods compatible with Tempstar specifications.
• Step 3 – Check combustion air: Ensure mechanical room has adequate combustion air openings or that dedicated combustion air piping is clear.
• Step 4 – Test pressure switch: Have a technician verify pressure switch operation under worst-case conditions and replace if marginal.