Precision intervention on a damaged compressor
At AirGreen , our HVAC repair technicians operate daily throughout the greater Montreal area to diagnose, repair, and optimize the performance of your appliances. This time, we were called to Sainte-Dorothée, Laval , for a problem with a Gree wall-mounted air conditioner showing symptoms of compressor and electronic board failure .
The context of the call
The customer contacted us after noticing that their wall-mounted air conditioner was no longer producing cold air, despite the indoor fan seemingly operating normally. An abnormal, intermittent noise was coming from the outdoor unit, accompanied by an electrical overheating smell . These signs indicated a possible electrical or mechanical problem within the compressor.
When we arrived on site, the outdoor unit, installed against a brick wall typical of Laval homes , was partially dismantled by the customer who had tried to clean it himself. This allowed us to quickly access the internal components , including the copper condenser , the control board , the hermetic compressor , and the fan motor .
Complete diagnosis of the fault
Our technicians carried out a series of methodical checks:
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Electrical inspection : measurement of supply voltage, circuit breaker test and visual inspection of connections.
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Compressor check : continuity and resistance test of the windings. The result revealed an internal short circuit .
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Inspection of the electronic board : several traces of overheating and burnt components were visible on the control board.
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Fan test : The motor turned freely, with no mechanical seizure or shaft lock.
After these tests, the diagnosis was clear: the main electronic card and the compressor had to be replaced . The rest of the refrigeration circuit (piping, condenser, expansion valve) was in good condition.
Technical intervention: replacement and recommissioning
Our team carried out a complete repair in two stages:
1. Replacement of the original Gree compressor
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Disconnection of the refrigerant circuit with gas recovery.
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Removal of the faulty compressor and cleaning of the internal circuit.
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Installation of a compatible Gree compressor (12,000 BTU) with silver solder and leak test with electronic detector.
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Complete vacuum refill before recharging with R410A refrigerant.
2. Replacing the main electronic board
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Installation of a new Gree control board , reprogrammed according to the unit model.
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Checking the communication signals between the indoor and outdoor units.
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Complete system testing over several operating cycles (cooling and defrosting).
Result: restored performance and reliability
Once the repair was complete, we observed an immediate return to optimal performance :
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Blowing temperature: 8°C at the outlet of the indoor unit .
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Refrigeration circuit pressure within nominal ranges.
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No leaks or electrical anomalies detected.
The customer, delighted to find a perfectly operational system before the return of hot days, also received our preventive maintenance advice :
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Clean the air filters every two months.
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Avoid covering or obstructing the outdoor unit.
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Schedule an annual inspection with AirGreen to extend the life of the compressor.
AirGreen Expertise: Beyond Repair
Each AirGreen intervention is based on three pillars:
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Accurate diagnosis — performed with calibrated measuring instruments and RBQ-certified procedures.
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Durable repair — replacement of only essential parts with original components.
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Customer support — clear explanations, transparent quotes and personalized recommendations.
Our technicians are trained to work on all brands of wall-mounted air conditioners : Gree, Fujitsu, Sharp, Midea, Lennox, Goodman, Bosch, and many others . Thanks to our expertise, we guarantee not only the restoration of service, but also the energy optimization of each repaired unit.
Why choose AirGreen in Laval?
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Fast service : same-day intervention in several areas of Laval.
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Certified technicians : holders of RBQ licenses and CCQ training.
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Repair warranty : 1 year on replaced parts.
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Total transparency : detailed report after each intervention.
At AirGreen , we view every repair as an opportunity to restore our customers' comfort and confidence . Whether in Sainte-Dorothée, Chomedey, Vimont, or Duvernay, our local teams are ready to meet your air conditioning and heating needs with the same rigor and attention to detail.
One last AirGreen tip
If your Gree wall-mounted air conditioner is showing signs of poor performance, unusual noises, or communication errors between units, it's important to act quickly. Early intervention often prevents complete compressor failure and significantly reduces repair costs.
Trust AirGreen – Climatisation & Chauffage , your HVAC specialist in Laval and Greater Montreal , for reliable, durable and certified repairs.