Fujitsu wall-mounted air conditioner repair in Côte-des-Neiges

A service call in a residential building in Montreal

At AirGreen , we were contacted for a service call in Côte-des-Neiges , in an apartment where a Fujitsu wall-mounted air conditioner was no longer producing cold air. The unit, installed for over ten years above a hallway door, also showed signs of visible dirt on the front facade and an internal water leak noticed by the customer for several weeks.

Initial diagnosis: fouling, condensate leak and overloaded motor

During our inspection, we observed that the indoor unit was accumulating a thick layer of dust and fine particles in the upper grille and on the evaporator coil. This lack of maintenance had caused:

• a reduction in airflow ,

• overheating of the fan motor ,

• and a blockage of the condensation drain , resulting in slight leaks on the door frame below.

We also noticed that the internal temperature sensor was responding slowly, a sign of electronic malfunction caused by accumulated moisture.

AirGreen Repair Steps

Our certified technicians undertook a complete and methodical cleaning of the Fujitsu unit, according to the AirGreen protocol:

1. Complete removal of the front cover and side fairing.
   This allows direct access to the evaporator and fan drum without damaging the fragile housing.

2. Deep cleaning of the coil.
   Application of an AirGreen disinfectant cleaner formulated to remove mold, grease, and fine dust without harming the aluminum.

3. Unblocking the condensate drain.
   We injected hot water at controlled pressure into the drain pipe to flush out accumulated deposits, often responsible for internal overflows.

4. Inspection and calibration of the fan motor.
   After disassembly, the motor was lubricated and then load tested to ensure that it runs at its rated speed without overheating.

5. Replacing the temperature probe.
   A new genuine Fujitsu sensor has been installed to ensure precise control of the cooling and heating mode.

Final checks and performance restored

After reassembly, our team carried out several essential checks:

• Blowing temperature : stabilized at 7.1°C after 12 minutes.

• Refrigerant pressure : within recommended parameters for model 12RLS2.

• Noise level : returned to less than 23 dB, confirming the perfect balancing of the fan drum.

• Drainage : tested at constant flow, without leakage or backflow.

The unit returned to its original performance, ensuring even cooling throughout the apartment. The client, satisfied with the result, immediately noticed the difference in sound and fresher air quality.

Technical details of the repaired system

• Brand : Fujitsu

• Type : Wall-mounted air conditioner (mini-split)

• Model : 12RLS2 Series

• Capacity : 12,000 BTU

• Refrigerant gas : R410A

• Estimated age : 10 to 12 years

Preventive maintenance: the key to extending lifespan

At AirGreen, we emphasize the importance of annual maintenance of wall systems , especially in Montreal buildings where dust and humidity are more present.
Simply cleaning the filters is not enough : you must regularly clean the coil and check the circuit pressures to prevent major problems.

We recommend our clients to:

• Have their appliance inspected every spring , before the hot season.

• Keep filters clean every 4 to 6 weeks.

• Avoid obstructing the unit with furniture or curtains.

• Monitor for any abnormal water flow or unusual noise .

AirGreen expertise in Montreal and on the Island

The intervention in Côte-des-Neiges perfectly illustrates AirGreen's ability to bring old systems back to life thanks to a rigorous diagnosis and precise repair. Our RBQ-certified teams, trained to CCQ standards, intervene daily in Montreal, Laval, Longueuil, and on the North and South Shores for repairs on heat pumps and wall-mounted air conditioners of all brands: Fujitsu, Gree, Sharp, Midea, Lennox, Trane, Goodman , and many others.

Final result

After our intervention, the Fujitsu wall-mounted air conditioner in Côte-des-Neiges is once again operating stably, quietly and efficiently.
The customer has chosen to join our AirGreen Entretien+ program , guaranteeing annual monitoring and optimal performance throughout the year.

AirGreen – Your HVAC repair and maintenance expert in Montreal and throughout Greater Montreal.