In a condo in Ville-Marie , our AirGreen technicians were called to repair a Fujitsu wall-mounted heat pump (indoor wall unit/mini-split). In the photo, you can see a wall unit installed very high , under a soffit/ceiling, with typical signs of a unit that has been used for several seasons: yellowing plastic , dirty grilles, and an air damper that no longer seems to provide as even a distribution as it did originally.
Even when a machine is “still working”, these visual indicators are often linked to concrete problems: decreased performance, less fresh air (or less consistent heating), increased noise, odors, erratic drainage… and rising bills.
Symptoms reported by the client (and what they generally mean)
The client described a common situation in condos:
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The machine starts, but refreshes less quickly than before;
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the airflow is irregular ;
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Sometimes, a musty smell appears;
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and the noise level became more noticeable.
On a Fujitsu wall-mounted heat pump , these symptoms most often point to a combination of factors:
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Internal fouling (filters, heat exchanger, turbine/fan wheel)
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Partially blocked drainage (tank + hose)
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Less commonly: suboptimal refrigerant charge (micro-leak, worn flare fitting, vibration)
AirGreen Diagnostic: a methodical approach, without approximations
On site, our priority was to measure before "treating":
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Complete visual inspection : condition of the fins, condensate tray, filters, flap, presence of greasy dust (typical kitchen/condo)
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Temperature measurements (return air vs supply air) to confirm the actual performance difference
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Drainage check : slope, siphon (if present), flow, signs of water/abnormal condensation
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Electrical control : power supply, connections, signal stability (probes/thermistors)
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Refrigeration check (if needed): consistency of pressures/temperatures, search for signs of micro-leaks
In this specific case, the diagnosis confirmed a dominant cause: restriction of airflow due to internal fouling + slowed drainage , which is enough to cause a drop in performance and create discomfort and odors.
Intervention: technical cleaning + drainage system upgrade
We carried out a “clean” repair, in the AirGreen sense: not just a quick vacuum, but a lasting restoration.
1) Controlled internal decontamination and cleaning
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Filter removal and washing
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Clean the heat exchanger (coil) with a suitable product (without damaging the fins)
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Cleaning the turbine/fan wheel (often the real cause of “less air”)
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Wiping and cleaning of the intake/exhaust areas
Immediate result: more direct airflow, reduced noise, more stable diffusion.
2) Condensate tray and drain pipe
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Cleaning the bin
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Unclogging/flushing the condensate drain
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Verification of flow under real-world conditions (water test + operation)
This is an essential step in condos: a slowing-down drain can cause humidity, odor, or even overflow in the medium term.
3) Performance checks after intervention
After reassembly:
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resumption of temperature measurements
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control of shutter operation and modes
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verification of stable operation (no abnormal cycling, no rubbing noise, no persistent odor)
Observable installation details: why they matter
This Fujitsu wall-mounted head unit is installed:
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High on the wall , close to the ceiling/soffit: good for diffusion, but requires serious maintenance (dust accumulates quickly at height).
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in a “finished” room (painted wall, moldings, mirror), so we always work with a clean and protected approach (tarpaulins, flow control during cleaning)
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Typical condo configuration: refrigerant lines and drain are usually hidden, making drainage diagnosis even more important
Final result: restored comfort, quieter machine, increased efficiency
Once the Fujitsu wall-mounted heat pump has been repaired:
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the air blown has become more constant again
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the part reaches the setpoint more quickly
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the operation is more discreet
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and the client regained clear confidence in their system, without daily “compromises”
At AirGreen, we always aim for the same objective: to restore the actual yield , extend the life of the machine, and prevent the problem from recurring during the next heat wave (or cold wave).
Our recommended maintenance method (simple, but costly)
For a wall-mounted heat pump like this one:
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Filters: every 4 to 6 weeks during the season
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Complete technical maintenance: once a year (often before summer or before winter)
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If there is odor, noise, or a drop in air quality: do not wait , because the buildup will eventually cost more (and can cause water damage).