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Réparation d’un climatiseur mural Fujitsu à Rosemont–La Petite-Patrie
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Fujitsu wall-mounted air conditioner repair in Rosemont–La Petite-Patrie

Air conditioning failure in a narrow corridor in Montreal

At AirGreen , we are regularly called upon to intervene in typical Montreal residential spaces, where space optimization sometimes makes air conditioning systems more vulnerable to wear and dirt. It was in an apartment building in the Rosemont–La Petite-Patrie district that a client contacted us about a Fujitsu air conditioning problem .

The wall-mounted unit, installed in a narrow hallway serving two bedrooms , blew warm, noisy air. In the midst of a heat wave, the comfort of the home was compromised—a classic case of neglected maintenance and a clogged component.

Diagnosis: Lack of maintenance and unbalanced fan

During our inspection, we noticed several signs of malfunction:

  • Warm air despite the “Cool” mode being activated.

  • Intermittent noise from the blower motor.

  • Filters heavily clogged with dust and fibers.

  • Condensation poorly evacuated , causing slight humidity on the wall.

These symptoms pointed to an imbalanced blower fan and advanced evaporator fouling , two problems that, combined, drastically reduce the performance of the wall-mounted air conditioner.

Our technician confirmed that it was a Fujitsu 12,000 BTU model, typical of residential wall-mounted installations in Montreal duplexes.

Steps of repair and return to service

1. Complete cleaning of the interior module

We disassembled the front cover and removed the filters for a thorough wash . The evaporator coil was treated with a specific cleaning product and then rinsed under low pressure to avoid any damage to the fins.

2. Fan rebalancing

The noise was coming from the misalignment of the tangential fan , caused by slight fouling and imbalance due to accumulated dust. Once disassembled, cleaned and repositioned, the motor regained its original stability.

3. Unclogging the drainage pipe

The condensate drain was partially blocked, which explained the moisture on the wall. We purged the pipe using a condensate vacuum and disinfected the pan to remove any bacterial buildup.

4. Checking the temperature sensor and refrigerant

Testing confirmed that the refrigerant level was correct and the temperature sensor was working properly after cleaning. We then conducted a full performance test .

Results: restored efficiency and total silence

When I restarted, the difference was immediate:

  • The blown air reached 13°C at the outlet , proof that the evaporator was working properly.

  • The ventilation noise was completely gone .

  • The customer noted a noticeable improvement in comfort in the adjacent rooms.

Thanks to a quick and methodical intervention , our team avoided an unnecessary engine replacement, a common mistake when the diagnosis is not carried out by a qualified technician.

Why these breakdowns occur in narrow corridors

Wall installations located in corridors are particularly vulnerable:

  • Dust accumulation due to constant air circulation between rooms.

  • Less space for natural ventilation , which causes the engine to heat up.

  • Condensation poorly directed when the drain is slightly inclined or too short.

At AirGreen, we always recommend professional cleaning at least once a year for wall units located in hallways or near bedrooms.

AirGreen: HVAC expertise in Montreal and throughout Greater Montreal

Our teams of RBQ and CCQ certified technicians work on all brands — Fujitsu, Sharp, Midea, Gree, Lennox, Bosch, Goodman, Trane, Zephyr, Hitachi — and in all neighborhoods of Montreal, Laval, Longueuil, the North Shore and the South Shore .

Each service call is treated with the same rigor:

  • Accurate diagnosis at home,

  • Fast and careful intervention ,

  • Complete transparency on repairs and costs,

  • Absolute compliance with safety and installation standards .

Conclusion

This Fujitsu wall-mounted air conditioner repair in Rosemont–La Petite-Patrie perfectly illustrates our approach: meticulous attention to detail, solid technical expertise, and a deep respect for customer comfort.

Thanks to simple maintenance carried out on time, the system has regained its full efficiency and sound discretion — guaranteeing a cool and peaceful summer in the heart of Montreal.

AirGreen – Heat Pumps, Air Conditioning & Heating
Your trusted HVAC partner in Montreal, Laval, Longueuil, North Shore and South Shore .