Fujitsu wall-mounted air conditioner repair in Saint-Lambert

When an aging unit shows signs of fatigue

At AirGreen , we are often called to diagnose and repair wall-mounted air conditioning systems that have been installed for over a decade. This was the case during our recent intervention in Saint-Lambert , on the South Shore of Montreal , where a customer contacted us about a Fujitsu wall-mounted air conditioner that was no longer properly cooling his living room during hot summer days.

Diagnosis: loss of performance and internal fouling

Upon arrival, we noticed that the wall unit—a Fujitsu model from the mid-2000s—was exhibiting several symptoms typical of a unit requiring extensive maintenance and upgrading :

• Low airflow despite fan at maximum speed

• Air outlet temperature warmer than expected

• Accumulation of dust and debris inside the heat exchanger

• Excessive condensation on the lower face of the unit

Our certified technicians performed a complete system diagnosis , including:

• Checking refrigerant pressures (R-410A)

• Outdoor Compressor Inspection

• Testing the electronic control board

• Measurement of inrush current at start-up

The verdict: The system suffered from advanced evaporator fouling , which drastically reduced heat transfer capacity, and a slightly low refrigerant level , causing inconsistent performance.

The intervention: deep cleaning and refrigerant recharge

We partially disassembled the indoor unit to access the evaporator coil. After protecting the surrounding surfaces, a complete chemical cleaning was performed to remove deposits that had accumulated over several seasons.

Afterwards :

1. A vacuum was drawn to ensure the circuit was watertight.

2. An R-410A refrigerant recharge was carried out according to the manufacturer's specifications Fujitsu.

3. The air filters have been replaced, and the blower blades cleaned.

4. A full operational test confirmed a return to full system efficiency.

Result: restored performance and satisfied customer

After the repair, the Fujitsu unit returned to a blowing temperature of 9°C and optimal airflow . The customer, who was worried about having to replace his unit, was pleasantly surprised by the difference: his wall-mounted air conditioner regained efficiency almost equivalent to that of a new unit.

We also took the time to review preventative maintenance with the owner, including:

• Clean filters every 4 to 6 weeks

• Annual inspection of refrigerant pressures

• Checking the condensate drain to prevent overflows

• Planning an AirGreen seasonal maintenance , before each summer

Why Choose AirGreen for Your HVAC Repairs

Across the South Shore , Montreal, and Laval, AirGreen stands out for its rigorous and humane approach to HVAC repair . Every service call is an opportunity to assess the system as a whole, not just the visible symptom. This often prevents future breakdowns and extends the life of units by several years.

Our technicians:

• Are trained on the brands Fujitsu, Gree, Midea, Sharp, Lennox and Bosch

• Use accurate electronic diagnostic tools

• Follow environmental protocols for handling refrigerants

• Always provide a clear and transparent explanation of the interventions carried out

The final word: maintenance saves money

A well-executed repair is often the best investment before considering replacement. In this specific case in Saint-Lambert , the customer saved several thousand dollars by extending the life of his existing appliance.

At AirGreen, we believe that regular maintenance and professional repairs can transform an aging unit into a system that will continue to perform for years to come.