In a condo in Ville-Marie , our AirGreen technicians intervened to recommission a Fujitsu wall-mounted heat pump (mini-split) , from the Halcyon line (typical size and screen printing). The indoor unit was installed very high on the wall , with adequate clearance near the ceiling, and a neat visual finish (discreet installation, perfect for a living space).
Context: Unstable comfort and declining performance
The customer contacted us because of the heat pump:
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heating and air conditioning were irregular (temperature that “ceilings”),
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was blowing less hard than before ,
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and occasionally exhibited slight flow/condensation at the bottom of the unit (a common symptom when the drain is partially obstructed or when the heat exchanger is clogged).
In a condo, this type of problem is particularly troublesome: the air circulates in more compact volumes, and a drop in flow is felt immediately (cold/hot zones, humidity, discomfort).
AirGreen diagnosis: on-site method, no assumptions
On site, we carried out a complete, step-by-step diagnosis:
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Visual inspection
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condition of the filters and the turbine,
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presence of dust on the evaporator,
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checking the condensate tray and the drain path.
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Performance metrics
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temperature measurement at the air inlet/outlet (thermal difference),
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control of actual airflow (flaps, fan speed, turbine noise).
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Refrigeration control
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Pressure readings and stabilization in heating/cooling mode.
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search for micro-leaks (typical points: fittings/flares).
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Diagnostic result:
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Significant fouling of the heat exchanger and turbine (direct cause of loss of flow rate and efficiency).
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Slowed drainage (beginning of obstruction), which may cause dripping or intermittent flow.
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A slightly loose connection on the refrigeration line (slow micro-leak) explains a less stable performance under certain conditions.
Repair: complete overhaul (cleaning + sealing + calibration)
We carried out a “clean” restoration as we do at AirGreen, that is to say by treating the cause, not just the symptom.
1) Thorough cleaning of the Fujitsu indoor unit
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secure removal of the caches
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Clean the evaporator (coil) with a suitable product.
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Complete cleaning of the turbine (blower wheel) , often responsible for low flow and noise.
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Controlled rinsing and protection of electronic components.
2) Unblocking and testing the drainage
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purging and cleaning of the condensate line,
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flow validation (continuous flow test),
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Checking the tray and slopes to prevent water from flowing back.
3) Correction of the micro-leak and restoration of the circuit
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refitting the connection (re-flare/tightening to the correct torque depending on access),
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leak test,
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vacuuming (evacuation) and charge adjustment according to system readings and specifications.
4) Final testing and customer validation
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Testing in heating and then in air conditioning.
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Temperature differential control, stability and noise,
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defrost cycle check (if applicable depending on the season),
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confirmation of comfort in the room.
Result: restored airflow, stable comfort, reassured customer
After the procedure:
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The airflow has returned to normal (stronger airflow, better diffusion).
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The target temperature is reached more quickly, without fluctuations.
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The risk of runoff has been eliminated thanks to the restored drainage.
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The customer has regained quiet and “regular” operation, typical of a well-maintained Fujitsu Halcyon wall-mounted unit .
What we recommend to prevent it from happening again
For a Fujitsu wall-mounted heat pump in a condo in Montreal:
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Filters: clean every 4 to 6 weeks during periods of intensive use.
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Complete maintenance: once a year (or every 2 years minimum), especially if the unit is running almost year-round.
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Signs to watch for: shortness of breath, odors, turbine noise, droplets, excessively long cycles.
At AirGreen, we always prioritize a sustainable approach: a clean, airtight and well-calibrated system consumes less, heats/cools better, and lasts longer.