A service call in the middle of winter: when snow gets in the way of HVAC maintenance
At AirGreen , we're often called upon to work in extreme conditions. This Midea VRF system repair in Sainte-Anne-de-Bellevue , on the West Island of Montreal, is a perfect example. On a freezing February day, our team was dispatched to resolve a fault affecting a variable refrigerant volume (VRF) heating system, which is essential to occupant comfort.
The context of the intervention
The client, the owner of a small commercial building, contacted us after noticing that certain areas of the building were no longer heating properly. Despite regular maintenance, the VRF system seemed to be struggling to maintain a stable temperature.
When we arrived, the scene was typically Quebec: a condenser covered in frost, temperatures below -15°C and a biting wind coming from Lake Saint-Louis.
Diagnosis of the problem
Our technicians began with a continuity and power supply test using a multimeter. A fault was quickly detected in the communication module between the indoor and outdoor units . The display showed an error code related to a communication problem or irregular voltage .
Upon opening the side panel of the Midea condenser, we confirmed that several wires showed signs of oxidation due to condensation and salt buildup over the winter. Power was flowing intermittently, causing a communication outage between the VRF system's electronic boards.
The steps of repair
-
Safety and power off : Before any manipulation, our technician cut off the power and discharged the capacitors to prevent any electrical risk.
-
Complete cleaning of the electrical compartment : Using a dielectric cleaner, the terminals and connectors were carefully deoxidized.
-
Replacement of corroded connectors : Damaged terminals and wires were replaced with reinforced insulation, moisture-resistant components.
-
Inter-unit wiring check : We then checked the integrity of the wiring connecting the indoor units to the condenser, to ensure that no breaks or short circuits remained.
-
VRF System Restart and Calibration : After power was restored, the system performed a restart cycle and automatic refrigerant (R-410A) distribution. All zones returned to a uniform temperature.
Result: performance and reliability restored
Within two hours, the Midea VRF system was back operating at full capacity. The client immediately noticed the difference: the offices and workshops were comfortable again, and energy consumption was back to normal.
We have also added a preventative recommendation : install a protective shelter over the outdoor condenser to reduce moisture infiltration and winter corrosion.
What this intervention demonstrates
This repair perfectly illustrates the challenges of HVAC maintenance in winter in Montreal and on the West Shore :
-
Temperature variations increase condensation and corrosion.
-
VRF systems, although very efficient, require regular checking of electrical connections and network communication.
-
A preventative inspection before winter often helps avoid costly service interruptions.
At AirGreen , we combine our technical expertise with in-depth knowledge of local climate conditions. Whether it's a Midea, Fujitsu, or Gree VRF system , our team has the experience and tools to efficiently diagnose and repair any type of fault—even at -20°C.
Our advice to avoid this type of breakdown
-
Maintain the system before the cold season , ideally in autumn.
-
Protect the condenser from falling snow and accumulated ice.
-
Monitor the error codes displayed on the control panel: these are often the first indicators of a communication problem.
-
Call a certified professional at the first signs of a drop in performance.
Why choose AirGreen?
Each intervention is documented, tested and validated according to the highest standards in the HVAC sector.
We serve Montreal, Laval, Longueuil, the North Shore and the South Shore , with rapid availability and total transparency on our diagnostics and repairs.
Thanks to our team, even a harsh winter will not compromise your comfort.