A service call at height: a wall-mounted compressor that is difficult to access
At AirGreen , we often operate in demanding technical conditions, where every detail counts. This service call, carried out in La Prairie , perfectly illustrates the rigor and safety that accompany our HVAC interventions. The customer contacted us after noticing that their Gree wall-mounted air conditioner was no longer cooling, despite the apparent noise of the outside fan.
Context of the intervention
The outdoor unit was installed approximately three meters above the ground, mounted on metal brackets along a red brick wall. Access required the use of a professional telescopic ladder and safety devices to allow the technician to safely perform the diagnostics.
The customer, who owns a small residential building, also mentioned noticing an increase in noise coming from the unit before the complete failure.
Initial diagnosis and verification of components
Upon our arrival, we carried out a visual inspection :
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The Gree unit showed signs of wear on the front panel.
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The power cables had slight slack at the gland.
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No defrosting or visible leaks, but the unit was no longer starting properly.
Using the multimeter , we confirmed that the power supply was indeed reaching the compressor. Therefore, the problem was an internal component —potentially the capacitor or the circuit board.
Diagnosis confirmed: defective capacitor and electronic board
After partial disassembly, tests revealed:
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A starting capacitor with a capacitance 40% lower than the nominal value.
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A slightly damaged electronic board , probably due to repeated power surges (common in residential areas).
This combination perfectly explained the symptoms: intermittent noise, difficult starting and no cooling.
Steps of repair
Our technicians then undertook a complete repair on site:
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Cut off the general power supply to secure the intervention.
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Replacement of the capacitor with an original Gree part, in accordance with the manufacturer's specifications.
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Inspection of the electronic board : cleaning of the connectors, resoldering of critical points and replacement of the control board.
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Check the wiring and tighten all connectors to prevent loose contacts.
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Soft restart test with voltage and current measurement.
Test results and final calibration
Once the board and capacitor were replaced, the compressor restarted immediately . Pressures were stable and the blowing temperature quickly reached 11°C—optimal performance for this range of wall-mounted air conditioners.
The abnormal noise had disappeared, proof that the compressor was now operating without excessive resistance.
Personalized advice to the client
Our technicians explained to the owner some good practices to extend the life of his installation:
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Install a surge protector on the power line.
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Clean the condenser and filters of the indoor unit at least twice a year.
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Schedule preventative maintenance in the spring to detect any electrical or mechanical drift before the warm season.
AirGreen expertise: rigor, safety and precision
This intervention demonstrates the importance of a methodical diagnosis and secure access to outdoor units. At AirGreen, we have all the necessary equipment to work efficiently, even when the installations are located at height or in restricted spaces.
Our certified technicians carry out:
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Complete on-site diagnostics , with precise measuring instruments.
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Manufacturer-standard repairs from Gree, Fujitsu, Midea, Sharp, and many others.
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Preventive monitoring to avoid recurring breakdowns and reduce energy consumption.
Final result: restored comfort and a reliable installation
After the repair, the Gree air conditioner resumed normal operation, providing fast and quiet cooling . The customer regained optimal comfort and the peace of mind of knowing that their HVAC system is now stable, secure, and calibrated to last.
In summary , this repair illustrates the skill and precision of the AirGreen teams in diagnosing and recommissioning Gree wall-mounted air conditioners . Whether it's a leak, an electronic failure or a starting problem, our experts intervene quickly in Montreal, Laval, Longueuil, on the North Shore and the South Shore , to guarantee long-lasting performance and total satisfaction.