A typical service call in Lachine: a broken wall-mounted air conditioner
At AirGreen , we frequently receive calls from homeowners and small businesses in Lachine who are experiencing problems with wall-mounted air conditioners that suddenly stop working. This was the case for this auto repair shop located in the industrial sector of Lachine, where a Fujitsu wall-mounted air conditioner installed high up refused to start despite recent temperature increases.
The customer, aware of the importance of maintaining a cool environment for his employees and for the garage equipment, contacted us urgently for a fast and reliable HVAC repair .
On-site diagnosis: a combined electrical and fouling problem
Upon our arrival, our technician carried out a complete inspection of the exterior wall-mounted condenser attached to a metal bracket above the garage door. The first observation:
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The unit made no noise or vibration,
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The internal circuit breaker had not tripped,
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But a significant accumulation of dust and mechanical oil residue partially covered the condenser grid.
A voltage test then revealed a power supply anomaly at the start relay . The ambient humidity combined with workshop residue had probably caused oxidation of the electrical contacts , preventing the compressor from starting.
Repair Steps
Our intervention took place in several specific phases:
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Power cut off for safety.
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Thoroughly clean the condenser surface using a mild HVAC-compatible degreaser.
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Replaced the start relay and checked the compressor wiring.
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Condenser fan test : it operated normally after repowering.
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Refrigeration pressure measurement : slightly low values, indicating a small leak on the liquid line.
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Leak repair , reseal and recharge with R-410A refrigerant according to Fujitsu manufacturer's specifications.
Result: a fully functional air conditioning system
Once the repair was complete, the Fujitsu wall-mounted air conditioner resumed normal operation. The temperatures in the garage dropped quickly, and the customer was able to resume operations without interruption.
We also recommended:
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Annual preventive cleaning of the condenser and indoor unit,
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The installation of an additional dust filter , suitable for industrial environments,
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And a check of the electrical connections before each hot season.
The importance of maintenance in industrial environments
Workshops, garages and production facilities are particularly demanding for HVAC systems . Fine oil particles, metal dust and temperature fluctuations contribute to quickly clogging wall units .
At AirGreen, we insist on:
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Bi-annual maintenance visits for high dust environments,
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The use of anti-vibration mounts to extend the life of the compressor,
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And an annual check of the refrigeration circuit to prevent any loss of efficiency.
AirGreen Expertise: Fast Service and Performance Guarantee
Our team is trained to work on all brands of wall-mounted air conditioners , including Fujitsu, Gree, Midea, Sharp, Hitachi and Bosch , in both the residential and light commercial sectors.
In Lachine, as everywhere in Greater Montreal, we provide:
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Precise diagnostics thanks to our electronic measuring tools,
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Repairs guaranteed to meet manufacturer standards,
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Available 7 days a week for HVAC emergencies.
The Lachine client expressed his satisfaction by highlighting the speed of our response and the clarity of our technical explanations. For us, each service call is an opportunity to demonstrate our commitment to reliability and transparency .
An AirGreen service that lives up to the Quebec climate
Quebec's climate requires efficient, well-maintained air conditioners . A wall-mounted system that is poorly protected against dirt or water infiltration can quickly break down. Thanks to our preventive and corrective interventions, we allow our customers to enjoy consistent comfort all year round .
Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore , AirGreen remains your trusted partner for all your wall-mounted air conditioner and HVAC system repair needs.