Home » Some of Our Service Calls in Greater Montreal » Repair of a Fujitsu wall-mounted heat pump in Sainte-Thérèse
Réparation d’une thermopompe murale Fujitsu à Sainte-Thérèse
Reading time: 4'

Repair of a Fujitsu wall-mounted heat pump in Sainte-Thérèse

A broken heat pump in spring: our rapid intervention in Sainte-Thérèse

At AirGreen , we know that a wall-mounted heat pump that stops working properly in early spring can quickly compromise a home's comfort. Recently, we were called to repair a Fujitsu heat pump installed on the exterior wall of a single-family home in Sainte-Thérèse , on Montreal's North Shore . The customer reported a lack of heat even though the unit appeared to be working, a typical symptom of a pressure problem or refrigerant leak.

Heat pump inspection: an accurate diagnosis

Upon arrival, we noticed that the Fujitsu outdoor unit was installed on a galvanized steel wall bracket, at the correct height, protected from ground moisture. A visual inspection quickly revealed several clues:

  • A buildup of dirt on the fins of the outdoor evaporator , limiting heat exchange.

  • Traces of oil around the refrigerant line connection , a potential sign of a refrigerant leak.

  • A slightly oxidized electrical connection at the wall circuit breaker, which can cause a voltage drop and unexpected compressor shutdowns.

We carried out a series of tests to confirm our diagnosis:

  1. Measurement of refrigeration pressures using our electronic pressure gauges.

  2. Checking the compressor inrush current , which was found to be lower than the standard indicated by the manufacturer.

  3. Nitrogen leak test to detect the exact source of the leak.

Result: a micro-leak on the flare fitting of the liquid pipe, probably due to slight loosening over time and seasonal thermal variations.

Complete leak repair and system maintenance

Once the leak is located, we have:

  • Tightened and re-flared with a calibrated tool to ensure a perfect seal.

  • Deep cleaned the condenser with a biodegradable product to restore heat exchange capacity.

  • Replaced R410A refrigerant according to the exact charge values ​​recommended by Fujitsu.

  • Revised the wiring and tightened the electrical connections in the outdoor junction box.

We then restarted the system and performed:

  • A performance test in heating and cooling mode.

  • A measurement of the blown air temperature , which increased from 19°C to 33°C in heating mode after repair.

Result: comfort restored and efficiency restored

After the repair, the heat pump operated stably, quietly, and efficiently. The customer immediately noticed a difference in temperature in his living room and the upstairs bedrooms. The compressor was now operating at full capacity without excessive power consumption.

We also recommended to the client:

  • Have the internal filters cleaned every two months.

  • Perform annual preventive maintenance in the spring to avoid any loss of performance.

  • Check the stability of the wall bracket after periods of freezing and thawing, in order to prevent any twisting which could exert stress on the refrigerant connections.

AirGreen Expertise: a trusted service on the North Shore

Every wall-mounted heat pump repair we perform at AirGreen showcases our methodical approach and experience with Fujitsu systems . Our certified technicians are trained to work on all major heat pump brands—Fujitsu, Midea, Gree, Lennox, Daikin, Trane, and many more.

Thanks to our extensive presence across the territory, we respond quickly in Sainte-Thérèse, Blainville, Laval, Repentigny, Brossard and throughout Greater Montreal . We take care of each installation as if it were our own, guaranteeing safety, performance and durability.

Why choose AirGreen for your heat pump repair?

  • Accurate and transparent diagnosis before any repair.

  • Certified technicians specializing in wall and central HVAC systems.

  • Fast service across the North Shore and South Shore.

  • Original manufacturer parts and maintenance in accordance with manufacturer standards.

  • AirGreen satisfaction guarantee on all our services.

In conclusion

This Fujitsu wall-mounted heat pump repair in Sainte-Thérèse demonstrates the importance of professional diagnostics and regular maintenance. By restoring proper pressure and eliminating the leak, we restored the system to full efficiency while ensuring optimal comfort for the customer during both the warm and cold seasons.

At AirGreen , we are proud to offer complete HVAC services —from repair to installation to maintenance—all over Montreal, Laval, Longueuil, the North Shore, and the South Shore .