Home » Some of Our Service Calls in Greater Montreal » Fujitsu wall-mounted heat pump repair in Southwest Montreal: comfort restored, operation stabilized
Réparation d’une thermopompe murale Fujitsu dans Le Sud-Ouest (Montréal) : confort rétabli, fonctionnement stabilisé
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Fujitsu wall-mounted heat pump repair in Southwest Montreal: comfort restored, operation stabilized

In a condo in Southwest Montreal , the client contacted us about a Fujitsu wall-mounted heat pump that was “working, but not like it used to.” On site, we immediately recognized a Fujitsu AIRSTAGE wall unit installed very high on an exposed brick wall , near a corner of the room—a common configuration in loft/condo-style apartments, but one that requires special attention to condensation drainage and air circulation.

Our mandate: to accurately diagnose the cause, carry out a lasting repair, and restore the system so that the customer regains stable comfort (heating and air conditioning), without abnormal noise or water leakage.

What the client observed (typical symptoms)

Upon arrival, the client described three clear signs:

  • Uneven heating : the unit blew lukewarm air, then seemed to "calm down", as if it lacked power.

  • Reduced airflow : even at high speed, the airflow was weaker than before.

  • Occasional water leakage : a few drops at the bottom of the unit, especially on more humid days.

These symptoms can point to several causes (drainage, fouling, sensors, refrigerant pressure, fan, etc.). Our approach: never "guess," but measure and validate each hypothesis.

AirGreen diagnosis: method, checks and final findings

We always proceed step by step, to isolate the true cause and avoid unnecessary repairs.

1) Visual inspection and installation

The unit is very close to the ceiling , on a brick wall. It's aesthetically pleasing and efficient, but it implies:

  • an impeccable drainage slope ;

  • an increased risk of micro-obstruction of the drain (dust + moisture);

  • access for maintenance is more complex if the clearance is minimal.

We also checked the stability (level, fixing), because a slight tilt can cause poorly drained condensation and drips on the facade.

2) Checking the heat exchanger and airflow

We checked:

  • the state of the filters ;

  • fouling of the internal battery ;

  • the rotation and behavior of the tangential fan .

Observation: significant soiling (fine dust) was present, reducing heat exchange and airflow. This is often enough to cause unstable heating and a feeling of "low power".

3) Drainage control (main cause of dribbling)

We tested:

  • the condensate tray;

  • the drain pipe (actual flow, not just “it looks okay”);

  • the presence of a partial obstruction .

Observation: partially blocked drain , which explained the intermittent water flow. On a wall unit, a few millimeters of accumulation can cause condensation to flow to the wrong place.

4) Functional checks (thermal + safety)

After cleaning and restoring the drainage system, we carried out the following:

  • a test in heating and air conditioning ;

  • a check of the supply and return temperatures;

  • a validation of the cycle (stability, absence of abnormal interruptions).

The system has become stable again: rapid temperature rise, normal airflow, and no more leaks.

Model: Visually, it's a Fujitsu AIRSTAGE wall-mounted heat pump (exact model not visible in the photo). In this type of installation in Montreal, high-performance series suitable for our climate are frequently found (e.g., the Orion XLTH range ), but we'll stick to the facts: the precise model is always confirmed by the nameplate.

Repair completed: what we actually did

Here are the actions taken, in a logical and safe order:

  1. Protect the area (brick wall, floor, furniture) to prevent any dust or splashes.

  2. Removing the hood provides access to the filters and the battery.

  3. Complete cleaning :

    • filters;

    • internal exchanger (appropriate cleaner, controlled rinsing);

    • fin check (straightening if necessary).

  4. Drainage system restoration :

    • drain rinsing/flush;

    • verification of the slope and actual flow;

    • continuous flow test.

  5. Final test :

    • Heating: stability and perceived power;

    • Air conditioning: condensation properly evacuated;

    • Noise and vibration validation.

Result: comfort restored, performance regained

At the end of the intervention, the client immediately noticed:

  • Stronger and more consistent airflow (airflow restored)

  • More efficient heating (faster temperature rise)

  • No more dripping/water leaks (functional drain and reliable drainage)

  • Confidence restored : the machine isn't "tired," it mainly needed targeted refurbishment.

In real life, this type of repair also changes daily life: fewer adjustments, less worry, and a heat pump that works in good conditions — therefore often less consumption for the same level of comfort.

Why this kind of problem happens (and how to avoid it)

In a residential environment, especially in condominiums, we often see these causes:

  • Fine dust (construction, air circulation, textiles) that clogs the heat exchanger.

  • Drain that gradually gets clogged : the system works “almost well”, until the day the water comes out in the wrong place.

  • Infrequent maintenance : a high-performance wall unit like a Fujitsu needs regular maintenance to remain stable, especially when it heats for a good part of the year.

Our simple recommendation: periodic preventative maintenance (cleaning + drainage + checks) avoids most “strange” breakdowns and protects the system’s lifespan.

Do you have a Fujitsu wall-mounted heat pump that is heating poorly or leaking?

At AirGreen , we operate throughout Montreal (including the Southwest ), Laval, Longueuil, North Shore and South Shore to rigorously diagnose and repair Fujitsu wall-mounted heat pumps: testing, cleaning, drainage, complete validation and concrete results.