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Réparation d’une thermopompe murale Fujitsu à Sainte-Rose
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Repair of a Fujitsu wall-mounted heat pump in Sainte-Rose

A typical service call in Laval: loss of performance on a Fujitsu unit

At AirGreen , our technicians work daily in residential areas of Laval , where Fujitsu wall-mounted heat pumps are particularly popular for their efficiency and reliability. In this specific case, our team was called to Sainte-Rose for an air conditioning breakdown in the middle of July. The customer reported that the indoor unit was blowing lukewarm air despite being set to 20°C.

Initial observation: an abnormal drop in cooling

Upon arrival, our technician immediately noticed that the Fujitsu wall-mounted heat pump (LAS series) was producing almost no cold. No error code was displayed on the light panel, but the indoor fan seemed to be running continuously without modulation, indicating an imbalance in the refrigerant cycle .

Step 1: In-depth diagnosis of the HVAC system

At AirGreen, each HVAC diagnosis follows a methodical approach:

  1. Visual inspection of the indoor unit: no apparent damage or visible water leaks.

  2. Check the air filter : slightly dirty, reducing air flow and heat exchange capacity.

  3. Evaporator coil check : Dust accumulation and light layer of frost, indicating a lack of refrigerant.

  4. Measurement of refrigeration circuit pressures (R-410A) : values ​​below the Fujitsu standard, confirming a slow leak .

  5. Condensate drain inspection : partially clogged, increasing humidity in the room.

Step 2: Complete Repair and Refurbishment

After locating the leak on a poorly crimped flare fitting at the rear of the outdoor unit, our technician carried out a complete repair of the refrigeration circuit :

  • Safe draining and recovery of R-410A refrigerant .

  • Re-crimping and re-soldering of the fitting using a silver alloy.

  • Leak tested under nitrogen at 300 psi for 30 minutes — no signs of leakage detected.

  • Vacuum draw to eliminate all traces of humidity and air.

  • Complete refrigerant recharge according to Fujitsu specifications.

  • Cleaning the drain and disinfecting the condensate tray to prevent bacteria.

Once these steps were completed, the unit was restarted and tested in air conditioning mode. The blowing temperature measured at the diffuser outlet quickly dropped to 9.8°C , demonstrating a return to optimal performance.

Step 3: Final checks and advice to the client

To ensure the durability of the repair, our technician carried out a series of additional checks:

  • Temperature sensor check and auto mode recalibration.

  • Cleaning the hood and fan blades to maximize airflow.

  • Power consumption measurement using a wattmeter: 18% reduction compared to the faulty state.

Before leaving, we took the time to explain some good maintenance practices to the client:

  • Clean air filters every 3 weeks during the summer.

  • Avoid obstructing airflow by placing furniture in front of the unit.

  • Schedule annual preventive maintenance to prevent yield losses.

Results: restored comfort and optimized consumption

Thanks to this intervention, the Sainte-Rose client immediately regained comfort. In just a few minutes, the living room's ambient temperature dropped from 27°C to 22°C, demonstrating the reliability and precision of Fujitsu wall-mounted heat pumps when properly maintained.

The customer's satisfaction was complete: the air was fresh again, the operation was quiet again, and improved energy efficiency guaranteed lower bills throughout the summer season.

AirGreen expertise: precision, transparency and performance

Our technicians specialized in repairing Fujitsu wall-mounted heat pumps operate throughout Greater Montreal, from Laval to Longueuil , including Montreal, the North Shore and the South Shore . Each service is based on:

  • Certified expertise in refrigeration and electricity.

  • Professional diagnostic tools (digital pressure gauges, thermal cameras, infrared thermometers).

  • Standardized procedures to ensure the quality and durability of each repair.

A clear commitment to performance

At AirGreen, our commitment doesn't stop at repairs: we're always looking to improve the performance of HVAC systems. In the case of this Fujitsu heat pump in Sainte-Rose , the results exceeded initial expectations. Once pressures were stabilized and airflow optimized, the unit returned to quiet and efficient operation—ready to take on the hot days of Laval's summer.