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Réparation d’une thermopompe murale Gree à Rosemont–La Petite-Patrie
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Repair of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie

An AirGreen intervention in an apartment building in the Rosemont district

When a wall-mounted heat pump stops providing the necessary heat in the middle of March, residents of an apartment building can quickly find themselves in discomfort. This is what recently happened to a client in Rosemont–La Petite-Patrie , Montreal. The outdoor unit, a Gree wall-mounted heat pump , installed high on a brick wall, was no longer producing sufficient heat despite a seemingly functional compressor.

At AirGreen , we were commissioned to diagnose and repair the system, while ensuring the safety of the wall installation and exposed electrical connections.

Diagnosis: Loss of performance and defrosting problem

Our technician first performed a complete visual inspection of the Gree outdoor unit , which was mounted on a sturdy but slightly inclined metal wall bracket. The customer mentioned that the system was constantly alternating between heating and defrosting modes , a telltale sign of a faulty temperature sensor or a faulty defrost probe reading .

Our diagnostic steps:

  1. Checking the refrigeration pressures : they were lower than normal, indicating a thermodynamic imbalance.

  2. Checking the external probe : the reading was inconsistent (−3°C while the ambient temperature was +2°C).

  3. Electronic module analysis : the defrost relay was triggered too frequently.

  4. Condensate drain inspection : slight blockage at the base of the evaporator plate, causing partial freezing to begin.

System repair and upgrade

Once the diagnosis was confirmed, we undertook a series of specific corrections:

  • Replacement of the defrost sensor with an original Gree part, calibrated according to the manufacturer's specifications.

  • Complete cleaning of the external exchanger , including the fins and the drainage tray.

  • Readjustment of the wall bracket to ensure a correct inclination for the flow of condensation water.

  • Recharge the refrigeration circuit with R410A at the recommended nominal pressure (120 psi in heating mode).

  • Electrical inspection : tightening of connections and replacement of the wall circuit breaker with a waterproof model that complies with CSA.

Performance tests: immediate results

Once the repair was completed, we turned on the Gree heat pump and observed the results:

  • Smooth start without abnormal cycles.

  • Switching to defrost mode only after 45 minutes, as expected by the system logic.

  • Indoor blown air measured at 34°C at the outlet of the wall console, proof of optimal thermal efficiency.

  • Reduced noise level thanks to cleaning and realignment of the fan.

The client, the owner of the building, immediately noticed that the tenants on the second floor found constant and even heat.

Maintenance advice given to the customer

We took the time to explain to the owner the best maintenance practices to extend the life of his wall-mounted heat pump:

  • Clean the internal filters every two months, especially during periods of heavy use.

  • Have the refrigerant charge checked annually before the heating season.

  • Ensure a minimum clearance of 30 cm around the outdoor unit , especially in winter to avoid snow accumulation.

  • Schedule AirGreen preventive maintenance every fall to prevent breakdowns during cold weather.

AirGreen Expertise in Montreal: Sustainable and Safe Repairs

This project perfectly illustrates the versatility of AirGreen teams : intervention on a brick building, working at height, managing restricted access and complete technical upgrades. Our technicians have the necessary certifications to work on all Gree , Midea , Fujitsu , Daikin , Lennox , Zephyr , Trane models and more.

We operate daily in Montreal , Laval , Longueuil , on the North Shore and the South Shore , whether for repair , installation or complete maintenance of residential or multi-unit HVAC systems.

Conclusion: restored efficiency and comfort found in Rosemont

Thanks to a rigorous approach, we were able to restore the full heating capacity of the Gree wall-mounted heat pump while securing its outdoor installation. The system now operates at optimal efficiency, ensuring occupants a stable temperature and restored energy efficiency.

At AirGreen , we believe that every job is an opportunity to demonstrate our commitment to quality, precision, and durability . It is this professionalism that makes us a leader in HVAC repairs throughout Greater Montreal.