No Heat? Furnace Checks for Durham Region
First cold snaps expose the little problems that stop furnaces from starting. Some checks are safe to try and can save a visit. If these steps do not restore heat or anything smells off, book HVAC Zack’s furnace service.
No heat? Furnace not turning on in Durham Region
Confirm Heat mode, a setpoint above room temperature, and fresh thermostat batteries. Make sure the furnace switch near the unit is On and the breaker has not tripped.
If a tripped breaker resets and trips again, stop and request service.
Furnace blowing cold air
Warm air should arrive within a few minutes of ignition. If the blower runs but the air feels cool, burners may not be lighting or may be shutting off. Turn the system off and schedule a diagnostic. If comfort is weak room to room, airflow may be part of the problem; see our duct design guide.
Fast, safe checks you can do
- Filter and airflow: Replace a dirty filter and keep returns and supplies open.
- Condensate: Ensure the small pump beside the furnace is plugged in and not overflowing.
- Intake and exhaust: Clear leaves or snow from outdoor PVC terminations.
- Furnace door: Reseat the lower blower door until the latch clicks.
If the furnace still will not start, note any flashing diagnostic light pattern for the technician.
When to stop and call
Raw gas smell, a sharp electrical odor, melted-plastic smell, CO alarm, breaker that trips again after a reset, repeated hard ignitions, or loud scraping noises. Turn the system off and book a diagnostic.
If a replacement decision is likely, you can review financing options and we will quote both repair and replacement.
Repair today, plan for the season
On a no-heat visit we confirm ignition and safety circuits, measure airflow and static pressure, and verify temperature rise.
If your system is older or has needed repeated fixes, we will price a focused repair and a replacement path, including hybrid options with a cold-climate heat pump. Same-day diagnostics available in Pickering, Ajax, Whitby, Oshawa, Courtice, and Bowmanville.