Toronto furnace safety: gas, carbon monoxide and shutdowns

Act on a suspected gas leak

If you smell rotten eggs or sulphur, suspect a gas leak or hear gas escaping, leave the area immediately. Once safely outside and away from the suspected leak, call 911. Enbridge Gas's Ontario emergency number is 1-866-763-5427. Do not use a phone, operate switches or electrical equipment, smoke, create a flame or start a vehicle near the suspected leak.

Do not spend time searching for the source, testing a connection or trying to repair it. Getting outside takes priority over gathering furnace information or sending an appointment message. If gas is burning, call 911 and do not attempt to extinguish it yourself. Follow the emergency responders' directions about remaining away and returning.

Treat a carbon monoxide alarm as an emergency

Carbon monoxide cannot be seen or smelled. If the CO alarm sounds its emergency signal, get everyone outside immediately and call 911 from a safe location. Do not stay inside to decide whether the furnace is responsible. Do not re-enter until a qualified emergency professional says the building is safe. Headache, dizziness, nausea, weakness or confusion can be signs of exposure, but the absence of symptoms does not dismiss an alarm.

A CO alarm is different from a natural-gas detector. An ordinary CO alarm does not detect a natural-gas leak, and the absence of a CO warning is not assurance that a gas smell is harmless. Respond to each hazard on its own terms.

Understand the current Toronto alarm requirements

Toronto's guidance reflects Ontario Fire Code changes effective January 1, 2026. In a house with a fuel-burning appliance, fireplace or attached garage, working CO alarms are required adjacent to each sleeping area and on every storey, following the manufacturer's instructions. Sleeping-area-only advice from older articles is incomplete under the updated requirements for qualifying homes.

Apartments and condominiums have additional building-specific conditions, including certain relationships to garages, service rooms and heated air supplied from fuel-burning equipment outside a suite. Consult the City's current guidance for the correct situation. Know the alarm's emergency, low-battery and end-of-life sounds in advance; if you are uncertain about possible CO exposure, get outside and seek emergency help.

An alarm supplements furnace maintenance

Keep required alarms working, test them according to current guidance and manufacturer instructions, and replace them at the end of their specified life. Do not disable a troublesome alarm or remove its battery to silence an unresolved warning. In a rental, report an impaired alarm to the landlord promptly. Landlords have installation and maintenance responsibilities; tenants must not disable the protection.

Professional furnace inspection and alarms address different parts of safety. An annual inspection can identify developing problems, while an alarm provides warning when hazardous CO reaches it. Neither replaces the other. A recent service invoice is not a reason to ignore an alarm, and a silent alarm is not a combustion-safety certificate.

Keep owner tasks within the manual

Owner maintenance should stay within the tasks assigned by the exact furnace manual, such as designated filter care and ordinary thermostat operation. Use the specified shutdown and access procedure, then restore panels before operation. Do not hold a door switch closed, operate the furnace with covers removed or use improvised filters or wiring. If the procedure is unclear, ask a qualified person to demonstrate the permitted task.

Fuel connections, burners, igniters, flame sensors, heat exchangers, internal electrical parts and safety controls are professional work. Generic online instructions cannot account for every model and installation. The fact that a component can be reached does not make it an owner-service item.

Respect protective controls and repeated shutdowns

A furnace may stop because a protective control has detected an unacceptable condition. A repeated shutdown therefore deserves diagnosis rather than repeated attempts to force another heating cycle. Record any fault visible through the normal display or viewing point. Give the technician the model and the observed sequence without opening combustion compartments to obtain more detail.

Never bypass a pressure, temperature, rollout or door safety switch. Do not reset a rollout device yourself. These controls serve different protective purposes, and replacing or bypassing one without resolving the cause can leave a serious hazard. A furnace that stops is inconvenient; defeating its protection can change the nature of the problem. Keep the displayed fault information for the technician instead of erasing the evidence through repeated power interruptions.

Respond correctly to an Ontario safety notice

Enbridge describes two safety-violation categories. An A violation indicates an immediate hazard, and gas to the appliance or building is shut off. A B violation is not an immediate hazard, but repairs are required within the stated period; Enbridge describes up to 42 days. Read the actual notice and deadline rather than assuming every notice provides the maximum time.

Use a TSSA-registered fuels contractor to complete the required work and communicate completion as directed. Enbridge does not service or repair the appliance. Keep the notice and completion records. Never reopen a shutoff, remove a tag or resume operation while seeking a cheaper quote or another opinion about an unsafe appliance.

Prepare useful information after the situation is safe

For an ordinary service inquiry, provide the Toronto postal code, furnace model if accessible, symptom, timing and visible error message. Mention any recent service and existing safety notice. Confirm whether a landlord or condominium manager must authorize access. These details support an appropriate visit, but they should never delay evacuation or an emergency call.

Keep the appliance area accessible and avoid combustible storage nearby. Observe safely accessible exterior intake and exhaust openings after storms, without climbing or dismantling equipment. If water reaches the furnace's electrical parts, keep away and arrange professional help. A straightforward routine of appropriate maintenance, clear access and prompt response to warning signs supports safer ownership without turning the owner into a repair technician.

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