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A furnace that runs but does not warm the rooms needs a different fix from one that will not start at all. Tell us what the thermostat shows, whether air is moving, and whether you have noticed a fault code, noise, or water near the unit. We use those details to guide the visit, then check the system before quoting a repair.
Last updated 2026-09-25. Published by GTA HVAC Pros.
If you smell rotten eggs or hear gas escaping, leave immediately. From a safe distance call 911 or Enbridge Gas at 1-866-763-5427; do not operate switches or use a phone near the suspected leak. If a carbon monoxide alarm sounds, leave the home and call 911 from outside. Do not wait for an HVAC appointment in either situation.
If there is no gas smell or CO alarm, check that the thermostat is set to heat above room temperature, that the furnace power switch is on, and that the breaker has not tripped. Look at the filter and replace it if it is visibly dirty and you know the correct size. Note any display code without removing safety panels. Avoid repeated resets or trying to work on gas or electrical components yourself.
A silent furnace may have a thermostat, power, door-switch, control, or safety-lockout issue. We trace the call for heat and the start-up sequence to find where it stops. A blinking fault light can help; record the code before cycling power, since a reset can erase useful evidence.
The fan can run even when the burners do not stay lit. Ignition, flame sensing, venting, condensate drainage, or controls may be involved. We check the operating sequence and the reason heat is not being delivered before recommending a part.
A furnace that starts and stops often can be reacting to restricted airflow, a control problem, or a safety limit. We check the filter, return and supply airflow, blower operation, and relevant controls. Repeatedly resetting a tripped system is not a substitute for finding the cause.
Rattling, squealing, or grinding can point to different mechanical problems. Water around a high-efficiency furnace may involve condensate drainage, but the source needs inspection. A brief dusty smell after first use is different from a persistent burning smell; shut the system down and request guidance if the smell persists or you see smoke.
We ask about the symptom and when it began, inspect accessible equipment and controls, identify the fault and any safety concern, then explain the proposed work before proceeding. When a part or additional work is needed, the scope and timing depend on the specific furnace and what the inspection finds.
A repair may be sensible when the fault is isolated and the rest of the system is in sound condition. If the repair is extensive, the equipment has recurring faults, or a safety issue changes the scope, ask for the findings in writing and compare repair with a properly planned replacement. We do not treat every no-heat call as a reason to replace the furnace.
Emergency steps and the Ontario gas emergency number for a suspected leak.
Leave immediately and call emergency services if a CO alarm sounds.
Ontario requirements and a way to verify a fuels contractor.
How to reach us when the heating problem cannot wait.
Open pageCompare the options after the actual fault is known.
Open pagePlan routine care and ask what your specific system needs.
Open pageSend equipment and symptom details before the call.
Open pageWe confirm symptoms, system type, thermostat behavior, airflow, equipment condition, and urgency before recommending next steps.
Repair, replacement, controls, ductwork, ventilation, and comfort issues are scoped clearly before work starts.
Heating and cooling work is completed with safety, access, setup, and system operation in mind.
We review operation, explain findings, and outline maintenance or replacement considerations when relevant.
Service Guides
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A dark thermostat is often the first visible sign that control power disappeared somewhere else. Start with the thermostat’s power type, then check the safe, accessible parts of the HVAC power path without bypassing a safety or shorting wires.
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Short cycling is a symptom, not a diagnosis. The useful clues are which part starts, how long it runs, what shuts off first, and whether the thermostat is ever satisfied.
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Since January 1, 2026, affected Ontario homes need a carbon-monoxide alarm adjacent to each sleeping area and on every storey—not only beside the furnace.
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