Home » Some of Our Service Calls in Greater Montreal » Fujitsu wall-mounted heat pump repair in Ville-Marie (Montreal): comfort restored, performance stabilized
Réparation d’une thermopompe murale Fujitsu à Ville-Marie (Montréal) : confort retrouvé, performance stabilisée
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Fujitsu wall-mounted heat pump repair in Ville-Marie (Montreal): comfort restored, performance stabilized

In a condo in Ville-Marie , our AirGreen technicians were called out for a Fujitsu wall-mounted heat pump installed high up, just above a doorway — a common location in urban areas, convenient for freeing up walls, but which requires impeccable installation and maintenance to avoid drainage, vibration and air circulation problems.

Upon our arrival, the customer described a classic scenario: less efficient heating, uneven airflow, and sometimes a feeling of "damp" or lukewarm air despite a high temperature setting. In short: the machine is working, but no longer delivering the expected performance .

What we observe on site (key indicators)

The photo shows a Fujitsu Halcyon -style wall-mounted indoor unit , installed near the ceiling and above an opening. This type of installation has several advantages (wide air distribution, discreet appearance), but also some points to consider:

  • Little margin at the ceiling : if the filters/exchangers get clogged, the unit's breathing degrades more quickly.

  • Position above a passage : the airflow is good, but the slightest imbalance can create uncomfortable drafts .

  • Drainage : an imperfect drain slope or a clogged drain can cause intermittent symptoms (reduced efficiency, odors, or even seepage).

Suspected problem: reduced performance + impaired drainage and heat exchange

With this type of wall-mounted heat pump, the drop in performance very often stems from a combination of factors:

  1. Fouling (filters + internal exchanger) → reduced heat transfer, less stable ventilation.

  2. Partially blocked drain → residual moisture, odors, irregular triggering.

  3. Micro-leak or slight lack of refrigerant (often at the fittings/“flares”) → less powerful heating, longer cycles, uneven comfort.

We never start from a “supposition”: we diagnose, we measure, we confirm .

Our AirGreen diagnosis (field method, not theory)

We proceed in stages, as with every residential service call:

  • Validation of modes and parameters (remote control, setpoint, ventilation speed, swing, sensors).

  • Temperature measurements : return air vs supply air, stability after 10–15 minutes.

  • Internal inspection : condition of filters, cleanliness of the heat exchanger, turbine, presence of abnormal humidity.

  • Drainage : flow test, slope check, cleaning if necessary.

  • Refrigeration circuit check (depending on access and configuration): search for signs of leakage, check of connections, leak test if required, then compliant refill.

Diagnostic result: the machine was functional , but limited by a combination of insufficient maintenance (heat exchange) and irregular drainage, with indices consistent with a weakened refrigeration efficiency .

Repair steps completed

Here is what we did, specifically, to bring the Fujitsu wall-mounted heat pump up to the expected level:

1) Complete technical cleaning of the indoor unit

  • Filter removal and washing

  • Thorough cleaning of the heat exchanger (coil) to restore heat transfer

  • Turbine inspection/cleaning (a frequent source of noise and irregular airflow)

👉 Immediate effect: more constant airflow, better temperature stability.

2) Restoration of drainage (prevention of “phantom” breakdowns)

  • Unclogging and rinsing the drain

  • Flow control and inspection of areas prone to deposits

  • Checking that no stagnation remains in the tank

👉 Effect: less residual moisture, elimination of conditions that impair efficiency and comfort.

3) Targeted and safe refrigeration checks

Depending on the installation configuration, we have:

  • Inspected accessible fittings (sensitive points)

  • Verified the consistency of the operating measurements (stability, heating response)

  • Corrected the necessary deviations to return to normal operation (without “overcorrecting”)

👉 Objective: to restore an efficient, stable heating cycle without overconsumption.

4) Final test under real-world conditions

  • Test in heating mode , then in air conditioning mode (when applicable)

  • Control of reactivity (temperature rise, stability)

  • Shutter adjustments and recommendations for setting up the shutter to avoid drafts above the passage

Result: restored comfort, renewed confidence

After the intervention, the client noted:

  • More powerful and consistent heating

  • Stable breathing , without tiring variations

  • Better air quality (less of a “humid” feeling)

  • A Fujitsu heat pump that once again becomes a real asset: comfort, efficiency, peace of mind

In a condo in Ville-Marie, where space is optimized and a discreet but efficient system is desired, this is exactly the desired result.

Our AirGreen recommendation for this type of Fujitsu wall-mounted heat pump

To prevent this problem from recurring (especially with a unit installed high up and near a ceiling):

  • Clean/vacuum the filters regularly

  • Perform a complete periodic maintenance (coil + turbine + drain)

  • Watch for early signs: decreased power, longer cycles, odors, abnormal humidity

  • Don't wait for it to break down: a heat pump that's "half-working" often costs more in electricity and wears out its components more quickly.