No heat or cold air
The thermostat calls for heat, but the furnace does not start or warm air never reaches the rooms.
Mississauga furnace repair
Furnace repair in Mississauga
A cold home is stressful. Tell our Mississauga team what the furnace is doing, when the problem began and whether you have an error code.
1585 Mississauga Vly Blvd Unit 101, Mississauga, ON L5A 3W9
Useful before you call
What to notice when your furnace stops heating.
A thermostat set to heat does not always mean the furnace has produced warm air. A system may fail to start, run the blower without heat, stop before the home reaches its setting, or repeatedly try to ignite. Note which of these is happening. That observation is more useful than guessing at a part that needs replacement.
Before calling, you can confirm that the thermostat is set above the room temperature and check whether other appliances have power. If an accessible filter is visibly clogged, note it. Do not open sealed furnace compartments, bypass a safety switch, work on gas piping or repeatedly reset a furnace that keeps locking out.
Mississauga homes vary from older detached houses in Cooksville and Port Credit to newer subdivisions around Erin Mills and Meadowvale. Equipment, ductwork and control setups differ, so a symptom that looks similar in two homes may have a different cause. A technician needs to evaluate the actual system before recommending a repair.
Cold air from the vents can occur when the blower runs but the heating cycle fails, or when the fan setting is left on continuously. Short cycling can be associated with controls, airflow or overheating, among other causes. A recurring ignition attempt, flashing fault code, grinding sound or sudden change in airflow should be reported rather than ignored.
When you call 647-478-2056, share your Mississauga postal code, furnace brand if visible, approximate age, thermostat setting, any display or fault code, and whether the issue began suddenly or gradually. Mention recent service or a power outage. These details help frame a productive service conversation without claiming an online diagnosis.
If you smell gas, leave the building and call 911 or Enbridge Gas at 1-866-763-5427 from a safe place. If a carbon-monoxide alarm sounds, get everyone outside and call 911. Do not treat a suspected gas or CO emergency as a routine furnace repair request.
- Dedicated Mississauga call line
- No-heat and cycling guidance
- Clear gas and CO safety steps
- Local Maps profile and contact details
Common service paths
Match the call to the problem.
These descriptions help you explain the situation. They are not a substitute for an on-site diagnosis.
Frequent starts and stops
The furnace shuts down before completing a normal heating cycle or repeatedly attempts to restart.
Ignition or fault code
A repeated ignition attempt, lockout or flashing diagnostic code needs a proper assessment.
Noise and airflow
New rattling, squealing, weak airflow or uneven heating can indicate different mechanical or distribution issues.
Local relevance
Toronto-area coverage.
Call with your postal code to confirm coverage for the property.
MississaugaCooksvillePort CreditStreetsvilleErin MillsMeadowvale
More ways to find help
Related service pages.
Questions before service
Clear, useful answers.
Why is my furnace running but blowing cold air?
The fan may be set to run continuously, or the heating cycle may not be completing. Check the thermostat setting, record any error code and arrange diagnosis if warm air does not return.
Is a furnace that turns on and off repeatedly safe to reset?
Avoid repeated resets. Short cycling or lockout can have several causes, and resetting can obscure the fault. Tell the service team how often it happens and what the display shows.
Should I repair or replace my furnace?
That decision depends on the diagnosis, equipment age and condition, repair scope, efficiency and your plans for the home. It should follow an assessment rather than a generic online rule.
What if I smell gas or my CO alarm sounds?
Leave the building immediately. For a suspected gas leak, call 911 or Enbridge Gas at 1-866-763-5427 from a safe location. If a CO alarm sounds, call 911 after getting everyone outside.
Which number serves Mississauga?
Call ASAP HVAC Mississauga Valleys at 647-478-2056 and share the property postal code and furnace symptoms.
Ready to describe the problem?
Call ASAP.
Share the location, equipment and symptom.
647-478-2056