Furnace Safety Check Before Cold Weather in Greater Vancouver

Before the first cold snap hits Greater Vancouver, completing a furnace safety check protects your household and confirms your heating system is ready.

What This Symptom Means

A furnace safety check is distinct from an efficiency tune-up — it focuses specifically on combustion safety, CO risk, and emergency shutdown reliability. Both are important, but the safety check ensures the system will not create a health hazard during operation.

Common Causes

• Safety risks that develop between seasons: heat exchanger fatigue, flue disconnection, burner deposits, CO detector battery failure, blocked intake or exhaust venting (bird nests, debris, wasps)

What Homeowners Can Check Safely

• Inspect the furnace exhaust and intake vents on the exterior of the home — remove any debris, bird nests, or wasp nests
• Test every CO detector in the home — press test button, replace batteries if response is slow
• Test smoke detectors on every floor
• Clear the area around the furnace of flammable materials
• Listen for the furnace on first startup — note any unusual smells, sounds, or visible smoke

When to Call a Licensed Technician

Some furnace issues require a licensed HVAC technician. Do not attempt to open gas lines, replace internal components, or reset persistent lockouts without professional diagnosis.

• Combustion gas analysis confirming CO production is within safe limits
• Heat exchanger inspection
• Flue connection inspection for gaps or corrosion
• Burner cleaning to ensure complete combustion
• Safety control functional testing (limit switch, rollout switch, pressure switch)

Frequently Asked Questions

What do I check on the outside of my home for furnace safety?

Locate the furnace exhaust and intake pipes on the exterior wall or roof. They should be clear of debris, bird nests, wasps, snow (in winter), or any obstruction. High-efficiency furnace vents are typically plastic PVC pipes exiting at grade level or through the side wall. Ensure a 1-metre clearance from the exhaust pipe in all directions.

How do I know if my CO detector is still working?

CO detector sensors have a limited lifespan — typically 5–7 years. Press the test button on each detector. If it responds slowly or not at all, replace it. Check the manufacture date on the back — if the detector is over 7 years old, replace it regardless of the test result.

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