An urgent call for restored comfort
At AirGreen , we know how essential a reliable air conditioning system is to daily well-being, especially on hot summer days in Greater Montreal. That's why our team was recently called to LaSalle to work on a Fujitsu wall-mounted air conditioner that had stopped working properly. The customer, concerned about the rising temperature inside his home, contacted us for a quick diagnosis and efficient repair.
Accurate diagnosis of an electrical problem
Upon arrival, our technicians noticed that the Fujitsu outdoor unit was securely mounted to a concrete block wall, sheltered beneath a wooden deck. While this installation provides protection from the elements, it sometimes limits natural ventilation, an important factor to consider for the performance of a wall-mounted HVAC system.
When the unit was powered up, there was no response: no fan or compressor noise. After a methodical check, our team identified an electrical fault related to the disconnect box located near the unit. Power was being interrupted due to a loose connection in the internal wiring —a common problem in facilities exposed to the humidity and temperature fluctuations typical of Montreal's climate.
Steps of repair
Our technicians undertook a series of specific interventions:
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Securing the electrical circuit and completely cutting off the power supply.
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Opening the disconnect box for inspection of connections and fuses.
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Replacement of oxidized terminals and complete tightening of the wiring.
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Continuity test to ensure stable power supply to the outdoor unit.
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Power up and complete testing of the Fujitsu system.
After these steps, the unit resumed normal operation: the outdoor fan was running at full speed, the compressor was starting without any abnormalities, and the indoor unit was distributing cold air at a constant temperature.
Technical analysis: what caused the breakdown
In this specific case, the main cause was gradual corrosion on the electrical connections due to prolonged exposure to moisture. The disconnect box was not completely sealed, allowing condensation to enter over time. This type of failure does not only affect Fujitsu systems, but can affect any HVAC unit installed outdoors.
To prevent this kind of problem, it is crucial to:
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Check the condition of the circuit breaker box at least once a year.
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Ensure that electrical cables are protected by waterproof conduits.
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Avoid installing the unit in a space that is too confined, where air circulation is poor.
These simple measures significantly extend the life of the system and reduce the risk of electrical failure.
Restored performance and a satisfied customer
After the repair, we took the time to explain to the customer how the disconnect box works and the importance of preventative maintenance. We also performed a light cleaning of the coils and checked the refrigerant pressure, which was found to be within Fujitsu specifications.
The result: a complete system restoration , without any unusual noise or temperature fluctuations. The customer was able to regain optimal comfort as soon as we left.
Why trust AirGreen for your HVAC system repair in Montreal
Our interventions, whether it is heat pump or wall-mounted air conditioner repair, are always guided by technical rigor and attention to detail. At AirGreen, each service call is treated with the same priority, whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore .
We provide:
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A quick and precise diagnosis thanks to our expertise on major brands (Fujitsu, Gree, Sharp, Midea, Hitachi, etc.).
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Durable repairs , carried out with quality parts and compliant with Quebec electrical standards.
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Courteous and transparent service , with a full explanation of the fault and maintenance recommendations.
AirGreen Tips: Maintaining Your Fujitsu Wall-Mounted Air Conditioner
To avoid similar failures, we recommend:
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A complete spring maintenance , including cleaning of filters and coils.
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An annual electrical inspection of the disconnect box and power cables.
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Maintain free space around the external compressor (minimum 30 cm clearance).
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To avoid the accumulation of leaves or snow under closed terraces or balconies.
These simple actions ensure better energy efficiency and reduce electricity consumption, while extending the life of your air conditioner.
Conclusion: expertise, precision and peace of mind
This Fujitsu wall-mounted air conditioner repair in LaSalle perfectly illustrates AirGreen's philosophy: to provide fast, professional, and long-lasting service. Thanks to our intervention, the customer regained the comfort of their home while avoiding a more costly breakdown in the long run.
At AirGreen, we are proud to be your HVAC reference in Montreal and its surrounding areas , for everything related to the repair, maintenance and installation of air conditioning systems and heat pumps.