Fujitsu wall-mounted heat pump repair in Ville-Marie (Montreal)

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:

• heating and air conditioning were irregular (temperature that “ceilings”),

• was blowing less hard than before ,

• 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:

1. Visual inspection

   • condition of the filters and the turbine,

   • presence of dust on the evaporator,

   • checking the condensate tray and the drain path.

2. Performance metrics

   • temperature measurement at the air inlet/outlet (thermal difference),

   • control of actual airflow (flaps, fan speed, turbine noise).

3. Refrigeration control

   • Pressure readings and stabilization in heating/cooling mode.

   • search for micro-leaks (typical points: fittings/flares).

Diagnostic result:

• Significant fouling of the heat exchanger and turbine (direct cause of loss of flow rate and efficiency).

• Slowed drainage (beginning of obstruction), which may cause dripping or intermittent flow.

• 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

• secure removal of the caches

• Clean the evaporator (coil) with a suitable product.

• Complete cleaning of the turbine (blower wheel) , often responsible for low flow and noise.

• Controlled rinsing and protection of electronic components.

2) Unblocking and testing the drainage

• purging and cleaning of the condensate line,

• flow validation (continuous flow test),

• Checking the tray and slopes to prevent water from flowing back.

3) Correction of the micro-leak and restoration of the circuit

• refitting the connection (re-flare/tightening to the correct torque depending on access),

• leak test,

• vacuuming (evacuation) and charge adjustment according to system readings and specifications.

4) Final testing and customer validation

• Testing in heating and then in air conditioning.

• Temperature differential control, stability and noise,

• defrost cycle check (if applicable depending on the season),

• confirmation of comfort in the room.

Result: restored airflow, stable comfort, reassured customer

After the procedure:

• The airflow has returned to normal (stronger airflow, better diffusion).

• The target temperature is reached more quickly, without fluctuations.

• The risk of runoff has been eliminated thanks to the restored drainage.

• 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:

• Filters: clean every 4 to 6 weeks during periods of intensive use.

• Complete maintenance: once a year (or every 2 years minimum), especially if the unit is running almost year-round.

• 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.