Fujitsu wall-mounted air conditioner repair in Ville-Marie

A service call in the heart of downtown Montreal

At AirGreen , we regularly receive calls from condominiums and apartments located downtown, where outdoor space is limited and air conditioning units must be installed on narrow balconies or urban terraces . This is precisely the case of this intervention in Ville-Marie , a stone's throw from the famous Molson building, where our team intervened to repair a Fujitsu wall-mounted air conditioner installed on a south-facing balcony.

Initial symptom: one outdoor unit at a complete standstill

The customer contacted us after noticing that the outdoor unit was no longer starting , despite the indoor control being turned on. The problem had worsened over the past few days, accompanied by a complete lack of cold air blowing inside. With the rising heat of spring, it was urgent to get the system back up and running .

Upon arriving on site, our technicians immediately noticed that the Fujitsu condenser , although compact and efficient, was suffering the consequences of constant exposure to the sun and wind , combined with an accumulation of dust and pollen on the suction grille.

Complete diagnostics: power supply, card and compressor

We carried out a series of precise checks:

• Power supply test to confirm voltage at terminal block.

• Checking the fuses and relays on the electronic board.

• Visual inspection of the compressor and fan for signs of overheating or mechanical blockage.

• Measurement of the starting current , which turned out to be zero — a sign of a faulty control board.

After disassembly, our technicians identified a burnt-out main control board near the compressor start relay. This type of failure is often caused by frequent voltage fluctuations in older buildings in the city center.

Performance repair and optimization

We replaced the electronic board with a genuine Fujitsu part, then carefully cleaned the condenser surface and fan fins.
To prevent future problems, we have also:

• Added surge protection device ,

• Readjusted the condenser level for better evacuation of condensation water,

• Optimized the passage of cables and refrigerant pipes , in order to avoid any pinching under the balcony floor.

Once the repair was complete, we performed a full performance test :

• Refrigerant circuit pressures in accordance with Fujitsu specifications,

• Stable cold air temperature at 9°C at the outlet of the indoor unit,

• Reduced noise level and smooth compressor operation.

Challenges of HVAC installations in urban environments

HVAC installations on downtown balconies come with their own challenges:

• Limited space for air circulation,

• Exposure to sun and urban pollutants ,

• Limited access for technicians , often requiring compact equipment.

This is why we recommend to our clients in Ville-Marie, Plateau-Mont-Royal and Verdun to:

1. Check the cleanliness of the condenser at least twice a season.

2. Never store objects or plants too close to the unit.

3. Schedule an annual professional interview , ideally in the spring, before the peak summer season.

Result: comfort restored and peace of mind assured

Thanks to this quick intervention, our client has regained consistent, quiet cooling in his downtown apartment. His Fujitsu wall-mounted heat pump is now operating at optimal efficiency, protected against electrical fluctuations, and ready to face the heat of Montreal's summer.

At AirGreen , we combine technical expertise and knowledge of the field to intervene effectively in all situations, from suburban homes to condominiums in downtown Montreal , Laval , Longueuil and throughout the North Shore and South Shore .