A service call in the heat of the moment: performance restored thanks to rapid intervention
At AirGreen , we regularly work in residential buildings in LaSalle , where wall-mounted heat pump systems ensure occupant comfort throughout the year. This time, our team was called to troubleshoot a Gree wall-mounted heat pump installed outside a home, attached to a red brick wall, right next to a laundry room.
The reported problem
The customer contacted us after noticing that their heat pump was no longer blowing cold air, although the outdoor unit appeared to be working. The compressor was making a slight humming noise , but no heat was being removed from the condenser . The user also noticed abnormal water flow under the indoor unit, which suggested a drainage or refrigerant pressure issue.
On-site inspection and diagnosis
Upon arrival, we carried out a complete inspection of the installation. The outdoor unit, securely mounted on metal wall brackets , showed some signs of corrosion on the underside of the chassis, a common sign of prolonged humidity.
Our initial pressure and temperature measurements revealed abnormally low refrigerant pressure , indicating a slow leak. We also detected that the condenser fan was spinning slower than normal , a result of a failing capacitor .
The points observed:
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Minor refrigerant leak at the liquid line flare fitting .
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Worn start capacitor limiting fan speed.
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Partially blocked interior drain , causing the flow reported by the customer.
Steps of repair
Our technicians undertook a series of actions to restore the Gree heat pump to perfect condition:
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Complete recovery of remaining refrigerant using a certified recovery station.
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Cleaning the circuit and pressurizing with nitrogen , to confirm the exact origin of the leak.
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Reforming the defective flare , applying sealing paste and tightening with the appropriate tightening torque.
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Replacement starting capacitor , genuine Gree part compatible with existing model.
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Complete cleaning of the interior drain and condensate tray , to prevent any future overflow.
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Recharge the system with R410A , respecting the manufacturer's nominal pressure values.
Results after intervention
Once the repair was completed, we performed a full performance check . The measurements confirmed that the heat pump was once again operating according to the manufacturer's specifications:
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Stable working pressure at 120 psi on low and 370 psi on high .
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Blown air temperature at 9°C at the outlet of the indoor unit.
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Fully operational automated defrost cycle .
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No abnormal noise or excessive vibration.
The relieved customer immediately noticed the difference: the system was cooling the room efficiently again, and the unwanted water flow had disappeared.
AirGreen Tips for Sustainable Maintenance
To prevent this type of breakdown, we recommended some good practices to the customer:
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Clean air filters every 4 weeks during periods of heavy use.
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Have the refrigerant charge inspected every two years.
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Check wall brackets to prevent corrosion and maintain good stability.
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Schedule preventative maintenance each spring before the warm season.
AirGreen expertise in LaSalle and Greater Montreal
This intervention in LaSalle demonstrates our technical expertise and our commitment to providing reliable and fast HVAC repairs on all makes and models. At AirGreen, every diagnosis is carried out with care, and every repair is guaranteed to meet the manufacturer's safety and performance standards .
Whether it's for a wall-mounted heat pump, a central air conditioner or a multi-zone system , we operate in Montreal, Laval, Longueuil, on the North Shore and the South Shore with the same commitment to excellence.
Conclusion
Thanks to a methodical approach and in-depth expertise, our team was able to bring this Gree wall-mounted heat pump in LaSalle back to life, ensuring optimal comfort and controlled energy consumption. At AirGreen, each intervention is an opportunity to demonstrate our commitment to quality, reliability, and the lasting comfort of our customers.