In a condo in Ville-Marie , our AirGreen technicians were called out to deal with a Fujitsu wall-mounted heat pump installed high up, near the ceiling, in a corner of a room adjacent to a window (a typical urban setup where every centimeter counts). The client described a frustrating problem: the unit would start and ventilate, but its cooling capacity would drop , with irregular cycles and difficulty maintaining a comfortable temperature.
We took charge of the complete diagnosis, then carried out a targeted repair to restore the machine to its normal performance level — without “temporary solutions”.
System type and model (consistent with the installation)
This is a Fujitsu brand wall-mounted heat pump (mini-split / wall unit) .
Since the exact model is not legible in the photo, we consider a common and consistent configuration with this format: Fujitsu Halcyon / wall series (residential generation), often installed in condos for its discretion, efficiency and precise regulation.
Installation context: what the image reveals
This installation has several important elements that directly influence the diagnosis and the quality of the repair:
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Unit placed very high , under a molding/cornice: excellent for air diffusion, but it requires impeccable management of drainage and clearances.
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Corner position , near a side panel: the refrigeration piping and the drain are usually grouped on one side , which can concentrate the stresses (vibrations, micro-movements, limited access).
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In condominiums, we often see shorter line runs, and sometimes an initial installation done “tightly”: this increases the importance of rigorous control of fittings (flares) and sealing.
Reported symptoms: why it wasn't cooling "like it used to"
In this type of case, the possible causes are numerous: clogged filters, dirty internal exchanger, communication problem, probe, drainage, or even gradual loss of refrigerant (often imperceptible at the beginning).
The client mainly described:
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inconsistent cooling
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cycles that seem to be "searching" for the right regimen,
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the feeling that the machine is “running”, but not giving as much.
This type of complaint is typical of a unit that is working, but not at its nominal output .
Our AirGreen diagnosis (on-site method, no approximations)
We proceeded step by step, as is always done when repairing a Fujitsu wall-mounted heat pump :
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Complete visual inspection
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condition of the filters and the heat exchanger,
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presence of abnormal humidity,
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checking the clearances around the unit,
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assembly and vibration control.
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Functional checks
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blowing temperature,
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stability of the regime (performance differences),
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behavior under high demand (air conditioning mode).
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Technical measurements and leak testing
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reading the operating parameters,
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search for signs of insufficient load ,
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inspection of accessible fittings (areas where micro-leaks are most frequent).
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In this case, our measurements and observations converged on a very concrete cause: a gradual loss of refrigerant , slow enough not to "crash" the system all at once, but present enough to degrade performance .
Repair completed: leak fixed and service restored
Once the source was confirmed, we applied a clean, compliant, and durable repair:
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Repair of the faulty connection (typical area: flare/line connection)
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Pressure test to validate the seal after intervention
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A thorough vacuuming process is required to remove air and moisture from the system.
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Controlled recharging according to the expected parameters for a Fujitsu wall-mounted heat pump in this category
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Cleaning and refurbishment of the indoor unit (filters + heat exchanger inspection) to prevent fouling from masking actual performance
Finally, we carried out a complete functional test : stability, blowing temperature, response to instructions and continuous behavior.
Result: restored comfort and stabilized performance
After repair:
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The heat pump cools at a constant rate .
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The cycles are more stable (less hesitation, less variation),
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The customer regains normal comfort, especially in a room where the unit is positioned high and has to "push" the air efficiently.
In practice, a correct charge and a sealed circuit is the difference between a machine that “works” and a machine that performs .
Why is this type of repair common in condos in Montreal?
In Ville-Marie , installations are often made in confined spaces: wall corners, high ceilings, compact cable runs. Over time, minor mechanical stresses (vibrations, expansion, micro-movements) can affect a connection if the initial installation is not perfectly optimized.
Our approach consists of:
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correct the cause (not just the symptom),
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verify the watertightness,
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reset the machine to its normal settings.
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and document the repair clearly.
When to call AirGreen for a Fujitsu wall-mounted heat pump
You should call us if you observe:
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The air conditioning is less powerful than before.
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Warm air in air conditioning mode.
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irregular cycles,
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unit that ventilates but no longer “follows”
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new noises, or performance that gradually degrades.
On a Fujitsu wall-mounted heat pump , the earlier you act, the simpler the correction — and the more you avoid unnecessarily wearing out the compressor.