When your furnace stops heating, every hour matters
A furnace failure during a Toronto winter is not something to wait on. Indoor temperatures in a detached home or semi can drop several degrees per hour once the heat is off, and frozen pipes become a real risk in basements and exterior walls within a few hours on the coldest nights. Our TSSA-certified team dispatches across Toronto and the GTA within two hours, 24 hours a day, because no-heat calls do not keep office hours.
Emergency furnace repair covers the full range of failures our technicians see every heating season: a furnace that ignites briefly and shuts off before the house warms up, one that cycles on and off every few minutes, one that runs the blower but delivers cold air, and one that will not attempt to start at all. Each symptom points to a different component, and identifying the correct fault on the first visit determines whether you are warm again in two hours or waiting for a part to be ordered.
Our technicians arrive with the most common furnace repair parts stocked on every service vehicle. Hot surface igniters, flame sensors, pressure switches, limit switches, capacitors, and blower motor components are on board, which is why most emergency calls are closed on the first visit rather than requiring a callback.
Common furnace failure modes and what causes them
Furnace ignites briefly, then shuts off before the house warms up
This is the most common winter emergency call. The igniter works, the burners light, and the unit shuts down within a few seconds. The usual cause is a dirty or failed flame sensor: the sensor cannot confirm the flame is present, so the control board locks out as a safety measure after one to three attempts. Cleaning or replacing the flame sensor resolves the problem in most cases. A failed hot surface igniter produces the same lockout sequence but without any successful ignition. Both parts are carried on the van.
Blower runs but the air coming from the registers is cold
The burners fire and the heat exchanger warms up, but the blower shuts down before delivering heat, or the limit switch trips on over-temperature and cuts the burners. Common causes are a completely blocked air filter, a failed blower motor capacitor, or a failing blower motor itself. A blocked filter is the easiest check before calling: if the filter is visibly packed solid, replace it and restart the system. If the problem continues, the remaining causes require a technician and a multimeter to diagnose safely.
Furnace will not attempt to start at all
No sounds, no draft, no ignition attempt. Check the thermostat first, then the circuit breaker for the furnace. If both are fine, the cause is usually a failed control board, a stuck-open pressure switch, or a failed draft inducer motor. These require proper electrical diagnosis to trace, and a failed inducer motor also prevents safe ignition because there is no combustion air draw.
Furnace short-cycles every two to three minutes
Turning on and off rapidly points to an oversized unit, a severely restricted filter, or a failing limit switch. In Toronto bungalows with finished basements, restricted return air is a common contributor, and correcting the ductwork often resolves the short-cycling more cheaply than replacing the furnace.
Draft inducer or gas valve failure
A failed draft inducer motor prevents ignition entirely because the pressure switch will not close without adequate combustion air draw. A failed gas valve means no fuel reaches the burner even when everything else is working. Both require a TSSA-certified technician to diagnose and replace under Ontario gas code, and both are within the scope of a standard emergency call.
What emergency furnace repair costs in Toronto
The diagnostic fee is $150 and applies to the repair if you proceed. Most emergency repairs land between $250 and $500 CAD including the diagnostic and parts. Weekend and after-hours calls carry a slightly higher rate, and you will see the exact number in writing before any work begins.
Common single-component failures, the igniter, flame sensor, pressure switch, or capacitor, typically resolve in the $250 to $350 range. Blower motor or control board replacements sit higher, usually $400 to $600. A gas valve or inducer motor replacement can approach or exceed $500 depending on the unit and parts availability. If the diagnosis shows that the repair cost is approaching the value of a newer furnace, our technicians will show you both numbers side by side and let you decide without pressure.
All pricing is in CAD and confirmed in writing before work begins. Weekend and after-hours rates are disclosed at the start of the call, not revealed on the invoice.
Emergency furnace repair across Toronto and the GTA
Our two-hour response covers all of Toronto’s neighbourhoods and boroughs, including North York, Etobicoke, Scarborough, East York, and York. Beyond the city, the same response target extends to Mississauga, Brampton, Vaughan, Woodbridge, Maple, Thornhill, Markham, Richmond Hill, Oakville, Burlington, Milton, and the Durham region including Ajax, Pickering, Whitby, and Oshawa.
Toronto’s older housing stock creates some urgency around furnace failures that newer suburbs do not face in the same way. Detached homes and brick semis in North York, Scarborough, and East York frequently have minimal insulation in the exterior walls and lose heat quickly once the furnace is off. Condo units with forced-air systems face a different set of challenges: the mechanical room is often tight, the furnace model is sometimes unusual, and building management may have restrictions on access. Our technicians are experienced working in both environments.
If your furnace has reached the end of its serviceable life and the emergency repair cost does not make sense, our TSSA-certified team can quote a furnace replacement during the same visit. If the no-heat call is connected to a gas shutdown or an Enbridge notice, our team handles Red Tag compliance and re-certification as part of a single visit where possible.
Call 647-254-4113 for emergency furnace repair anywhere in the GTA
No heat is a genuine emergency. Call 647-254-4113 any time, day or night, and our TSSA-certified team will be on-site within two hours across Toronto and the Greater Toronto Area.
