What to Do If Your Furnace Stops Working in London Ontario

A furnace breakdown in London, Ontario winter can happen fast — often at night or during extreme cold snaps. No heat means risk of frozen pipes, discomfort, and even carbon monoxide danger if something’s wrong. As owner and lead TSSA-certified technician at Hawana HVAC Solutions, I’ve responded to hundreds of these emergencies across London, St. Thomas, Strathroy, Woodstock and more. Here’s your step-by-step 2026 guide: what to do immediately, common causes, and when/how to get fast professional help.

Step-by-Step: What to Do Right Now If Your Furnace Stops

1. Stay calm & check for safety – If you smell gas or suspect carbon monoxide (headache, nausea, dizziness), leave home immediately & call 911. Use a CO detector — every London home needs one.
2. Check thermostat – Ensure it’s set to “heat” (not “cool” or “off”), batteries are good, and temperature is higher than room temp.
3. Replace air filter – Dirty filter is #1 cause of no heat. Swap it (keep spares on hand). Reset system by turning off at thermostat, wait 5 min, turn back on.
4. Check breaker & power – Furnace may have tripped breaker or blown fuse. Reset if safe; if it trips again, call pro.
5. Check pilot light (older models) – If out, follow manufacturer instructions to relight. If electronic ignition, don’t attempt — call us.
6. Listen for noises – Blower running but no heat? Possible ignitor or gas valve issue. No sound? Could be thermostat or control board.
7. If still no heat – call emergency service – Don’t wait. Hawana offers 24/7 response with 2–4 hour arrival in most cases. Emergency furnace repair London Ontario.

Most Common Furnace Failure Causes in London Ontario Winters

• Dirty or clogged air filter – Restricts airflow, overheats system, shuts down safety switches.
• Failed ignitor or flame sensor – Common in high-use winter months. Cost: $150–$350 fix.
• Thermostat malfunction – Batteries dead or wiring loose. Often simple $100–$200 fix.
• Blower motor or capacitor failure – No air movement. $450–$950 repair.
• Gas valve or control board issue – No gas flow. $350–$750 fix.
• Frozen condensate line (high-efficiency models) – Common in cold snaps. Quick thaw & insulation fix.

Safety Tips During a No-Heat Emergency in London ON

• Use space heaters safely (never unattended, keep 3 ft from flammables)
• Keep interior doors open for air circulation
• Close curtains at night to retain heat
• Monitor CO levels – install/ test detectors
• Avoid oven use for heating (fire & CO risk)

Furnace Down? 24/7 Emergency Service – Call (647) 550-4220 Now

What London Homeowners Say About Our Winter Emergency Service