Repair of a Comfortmaker wall-mounted air conditioner in Plateau-Mont-Royal

A noisy wall unit in a typical Montreal condo

At AirGreen , our work in buildings in the Plateau-Mont-Royal region often presents us with unique technical challenges: limited access, installation height, and compact units installed on brick walls. This was precisely the case during a service call for a Comfortmaker wall-mounted air conditioner , suspended on the red brick rear facade of a typical building in the area. The client had contacted us after noticing a persistent metallic noise and a loss of cooling performance .

Initial diagnosis: abnormal vibrations and restricted airflow

Upon arrival, we performed a visual inspection of the outdoor unit. Mounted on metal wall brackets , the installation appeared stable, but a careful examination revealed several worrying signs:

• The bracket mounting screws had loosened slightly due to repeated vibrations.

• A buildup of dust and debris was partially blocking the air outlet through the rear grille.

• The fan vibrated irregularly, causing a metallic noise with each rotation.

Using our thermal imaging camera, we also noticed that the compressor was reaching a higher than normal temperature, a sign of mechanical stress caused by poor heat dissipation.

Repair steps: AirGreen rigor and precision

To restore the proper functioning of the Comfortmaker wall-mounted air conditioner , our certified technician performed the following steps:

1. Securing the support structure :
   The wall anchors were dismantled, cleaned and tightened with new galvanized fixings, ensuring perfect stability despite the elevated position.

2. Complete cleaning of the condenser :
   We performed a low-pressure wash to remove the accumulated dirt from the condenser fins. This immediately improved airflow.

3. Fan rebalancing :
   The slightly misaligned fan was accurately disassembled, straightened, and reinstalled. Once the rotation was tested, the metallic noise was completely gone .

4. Checking the refrigerant circuit :
   The suction and discharge pressures were measured and found to be within the operating values ​​of the installed Comfortmaker model.

Result: a quieter and more efficient unit

After the repair, the wall-mounted air conditioner returned to its optimal performance . The parasitic noise disappeared, the air temperature at the evaporator outlet stabilized at 11°C, and the customer was able to immediately regain comfort without excess electricity consumption .

Our team also took advantage of this visit to remind people of some good maintenance practices , essential for Montreal condo owners:

• Clean the indoor unit filter regularly.

• Clear the area around the outdoor condenser to ensure good airflow.

• Schedule an annual inspection before each summer, especially for high-rise installations exposed to the elements.

AirGreen expertise at the service of urban comfort

This type of intervention perfectly illustrates AirGreen 's expertise: a mixture of technical rigor, in-depth knowledge of brands such as Comfortmaker , Gree , Fujitsu , Midea and Bosch , and constant adaptation to the realities of Montreal's urban buildings .

Our technicians are trained to work on all wall-mounted HVAC systems—whether it's a refrigerant leak, an electronic board failure, or a mechanical problem related to the fan—always in compliance with CMMTQ and CSA standards.

Prevention and maintenance: advice from our experts

1. Watch for unusual noises : these often indicate a fan imbalance or loose mounting.

2. Clean the condenser fins at least twice a year.

3. Check the stability of the supports : freezing and thawing in spring can weaken wall anchors.

4. Avoid visual or plant obstructions around the unit. Even a small plant too close can hinder ventilation.

With regular preventative maintenance , a Comfortmaker wall-mounted air conditioner can provide more than 15 years of reliable performance, even in the demanding climatic conditions of the Plateau-Mont-Royal.

AirGreen — Experts in residential HVAC system repair and maintenance in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
Fast, precise and professional service, adapted to your urban or residential environment.