Furnace Repair in Gatineau
A furnace that will not stay lit, keeps locking out, or has simply gone cold usually comes down to one of a short list of causes: an ignition problem, a dirty flame sensor, a pressure switch fault, or a clogged filter starving the system of airflow. We repair gas, propane and electric furnaces throughout Gatineau, Hull, Aylmer, Buckingham, Masson-Angers, Cantley, Chelsea and Val-des-Monts. Call 819-800-6457 and describe the lockout light pattern or symptom you are seeing.
Gas smell comes first
If you smell gas near your furnace or anywhere in the home, leave the building right away, do not touch switches or the thermostat, and call the gas utility or 911 from a safe location. Only call an HVAC contractor after the utility confirms it is safe to re-enter.
Lockout codes and ignition faults
Most modern furnaces flash a light code when they lock out, pointing to categories such as ignition failure, limit switch trips, or pressure switch faults. We ask about the blink pattern on the call because it often narrows down the likely cause before the technician arrives.
Flame sensor and pressure switch issues
A flame sensor coated with residue can cause the furnace to ignite briefly and then shut off repeatedly, mistaking a dirty sensor for no flame at all. A pressure switch fault often relates to a blocked vent, a failing inducer motor, or condensate blockage on high-efficiency units.
Airflow and filters
A severely clogged filter restricts airflow enough to trip high-limit switches and shut the furnace down as a safety measure. Checking and replacing the filter regularly is one of the simplest ways homeowners can prevent avoidable service calls.
How it works
- 01
Safety first
If gas is suspected, leave the building and call the utility or 911 before calling us.
- 02
Call and describe the fault
Tell us the lockout light pattern, whether the furnace attempts to ignite, and any recent changes.
- 03
Diagnosis on site
The technician tests ignition components, safety switches, and airflow to pinpoint the cause.
- 04
Repair and explanation
You hear what failed and the repair options before work proceeds.
Frequently asked questions
My furnace lockout light is blinking a pattern. What does it mean?
Blink patterns are manufacturer-specific and correspond to categories of faults such as ignition failure or a pressure switch problem. Note the pattern and tell us on the call so we can prepare for the likely cause.
My furnace short-cycles, lighting then shutting off quickly. Why?
This is a common sign of a dirty or failing flame sensor, which mistakes a coated sensor rod for the absence of flame and shuts the burner down as a safety response.
Can a dirty filter really stop my furnace from running?
Yes, a badly clogged filter restricts airflow enough to overheat the heat exchanger, which trips a limit switch and shuts the furnace down until it cools and the filter issue is resolved.
Do you repair propane furnaces as well as natural gas?
Yes, we service both propane and natural gas furnaces, along with electric furnaces used in some Outaouais homes.
Is it safe to keep resetting my furnace when it locks out?
Repeatedly resetting a lockout without addressing the cause is not recommended, since it can mask a safety fault. Have it diagnosed rather than continuing to reset it.
Related services
A project, a question or a breakdown?
Send us the details or call us. We assess the situation with you before proposing anything.
Call us 24/7 — Our phone line is open at all times. Technician availability is confirmed during the call.