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Réparation d’un système VRF Toshiba à Brossard
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Repair of a Toshiba VRF system in Brossard

A critical breakdown on a commercial construction site: rapid intervention by AirGreen

One June morning in Brossard , our AirGreen team was called in to work on a Toshiba VRF system installed on the construction site of a future commercial building. The general contractor noticed a complete shutdown of the air conditioning system , while the interior design work required a controlled temperature for drying materials and worker comfort.

On site, two Toshiba Digital Inverter outdoor units were installed in parallel, powering several indoor evaporators spread over three floors. The symptoms reported: no compressor start , flashing error lights , and unstable power at the electrical boxes.

Initial diagnosis: power failure and communication interrupted

Upon our arrival, we secured the perimeter of the site and carried out a complete analysis of the HVAC electrical network . The diagnostic tools quickly highlighted:

  • An intermittent voltage drop on the 240 V supply line.

  • A communication error between the master and slave units (Toshiba error codes P08 and C03).

  • Non-compliant temporary electrical connections used for site tests.

  • A suspected power surge may have affected the main electronic board of one of the units.

Thanks to our calibrated measuring instruments , we were able to isolate the problem at the temporary distribution box installed by an electrical subcontractor.

Technical intervention: repair of the card and restoration of the circuit

Once the diagnosis was confirmed, our specialized technicians undertook a methodical intervention :

  1. Complete system shutdown and safe disconnection of power cables.

  2. Inspection of the main control board (PCB) : We detected a trace of overheating on a power relay.

  3. Preventive replacement of the electronic module with an original Toshiba part, supplied by our central warehouse in Montreal.

  4. Cleaning and tightening terminal block and communication cable connections .

  5. Bringing power cables into compliance with CSA-certified industrial extension cords.

  6. Complete functional test of both compressors and verification of VRF cycle synchronization.

Everything was done in the same day, despite the external conditions (work on asphalt ground with temporary power supply).

Result: reliability and performance restored

After being put back into service, both Toshiba VRF units returned to normal operation. Tests revealed:

  • Perfect voltage stability over the entire operating range.

  • No loss of communication between indoor and outdoor modules.

  • Refrigeration pressure balanced at 420 psi on the high pressure circuit.

  • Optimal energy efficiency with uniform interior temperature rise.

The site manager particularly appreciated the speed and precision of our intervention, which made it possible to avoid a delay of more than 48 hours in the work schedule.

AirGreen's expertise in commercial VRF systems

VRF (Variable Refrigerant Flow) systems , such as those from Toshiba , represent the cutting edge of commercial air conditioning technology. Their complexity requires advanced technical expertise—a specialty of AirGreen , which regularly works on this type of equipment in Montreal, Laval, Longueuil, on the North Shore and the South Shore .

Our certified technicians perform:

  • Electronic diagnostics with proprietary reading tools.

  • Repair of control boards and VRF components.

  • Software update and compressor recalibration .

  • Preventive maintenance and refrigerant flow balancing .

This technical mastery allows us to offer rapid, safe and sustainable interventions , even in the most demanding construction site environments.

Professional advice for temporary commissioning of a VRF system

When a VRF system is temporarily powered before final delivery of the building, it is crucial to observe certain precautions:

  • Use only certified distribution boxes with differential protection.

  • Avoid any unprotected branch connection .

  • Ensure that grounding is properly performed before any testing.

  • Plan thermal monitoring of the electronic cards during the first hours of start-up.

These simple measures can help avoid costly breakdowns and installation delays.

An exemplary repair, a site saved

Thanks to our AirGreen team , the Brossard construction site was able to resume normal operations without major interruptions. This type of intervention perfectly illustrates our commitment: to act quickly, diagnose accurately and restore HVAC performance with rigor and transparency .

AirGreen – Specialists in commercial VRF and HVAC systems in Montreal, Laval, Longueuil, on the North Shore and the South Shore.