When a furnace breakdown threatens the comfort of a Laval home
At AirGreen , we know how essential a reliable heating system is during Quebec's harsh winters. Recently, our team was called to Sainte-Rose (Laval) for an urgent repair on a Lennox furnace , a central model widely used in single-family homes in the region. The customer had noticed that their system was no longer blowing hot air and that an unusual odor was coming from the mechanical room.
Complete diagnosis of the fault
Upon our arrival, our certified technician conducted a complete inspection of the HVAC system . The Lennox model on site was a high-efficiency electric furnace, connected to a galvanized duct system distributing heat throughout the house. The problem initially appeared to be electrical: the fan wouldn't turn on, even though the thermostat was correctly sending the command.
Step 1: Checking the electrical circuits
After turning off the power, we tested the blower relay and the main control board . The analysis revealed a faulty control board , unable to activate the heater resistor. This type of failure is common on models over ten years old, especially when condensation accumulates near the electronic components.
Step 2: Inspect the air system and filter
We then checked the air filter , which was saturated with dust and insulation. This obstruction was increasing the internal temperature of the furnace and had likely contributed to the electronic failure. So we replaced the filter with a pleated MERV 11 model , which was better suited to the needs of the house.
Step 3: Checking the condensate drainage
Since the Lennox furnace was connected to a central heat pump , the condensate drain pipe also needed to be cleaned. We performed a thorough flush of the PVC pipe, removing a blockage formed by limescale deposits.
The solution implemented
Once the diagnosis was confirmed, we replaced the electronic board with a genuine Lennox part, recalibrated the temperature sensors, and tested communication with the wall thermostat. The system restarted without difficulty, displaying uniform hot air distribution throughout the ducts. We also took advantage of the intervention to perform an airflow check , slightly adjusting the speed of the blower motor to optimize energy efficiency.
Final result:
-
Heat restored immediately
-
No overheating or untimely shutdown
-
Stabilized electricity consumption
-
Customer reassured and ready for winter
The Importance of Regular Electric Furnace Maintenance
This intervention perfectly illustrates the importance of annual preventive maintenance . A simple inspection in the fall would have detected the aging card before it failed. At AirGreen, we recommend:
-
Check electrical connections once a year.
-
Clean or replace the air filter every three months.
-
Check condensate drainage to prevent moisture infiltration.
-
Perform a full startup sequence test before the cold season.
These simple actions help avoid costly repairs and ensure the longevity of your device.
AirGreen expertise: speed, precision and transparency
Every service call is an opportunity for us to demonstrate our commitment to quality and reliability . Our technicians don't just fix things: they explain the problem, offer lasting solutions , and leave every job site clean and compliant with current standards.
In Sainte-Rose as elsewhere in the greater Montreal region, Laval, Longueuil, the North Shore and the South Shore , AirGreen remains a reference for repairs of Lennox, Goodman, Trane, and several other brands of furnaces .
When to replace rather than repair?
In some cases, especially when the furnace is more than 15 years old, it is wise to consider a complete replacement . Newer models with variable speed technology offer superior efficiency and can be coupled with a Midea 28 heat pump for remarkable energy savings.
Our experts can assess on-site the profitability of such an upgrade and inform you about the subsidies available in Quebec .
Conclusion: comfort rediscovered in Sainte-Rose
Thanks to a quick and methodical intervention, we restored the Lennox furnace in this Laval home, ensuring warmth and peace of mind. This mission is a reminder that with an experienced HVAC partner like AirGreen , every problem finds a lasting solution, even in the most demanding conditions.