A service call in the city center
At AirGreen , we often receive calls from customers living in apartment buildings in the heart of Montreal , particularly in the Plateau-Mont-Royal , where outdoor units are often installed on small balconies or terraces.
That day, a Plateau resident contacted us about a Fujitsu wall-mounted heat pump that refused to start, despite an indicator light still being on on the indoor unit.
On-site inspection: constraints of a narrow balcony
The installation was located on the third floor, on a narrow balcony typical of buildings in the Plateau , with an outdoor unit securely fixed to a metal support.
Upon arrival, our technician checked the security of the access before carrying out the electrical and refrigerant diagnosis .
A few observations quickly guided the diagnosis:
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The outdoor fan would not start .
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The compressor remained inactive despite a signal sent from the indoor unit.
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Slight oxidation was visible on the connection terminals.
These clues pointed to a faulty control board or relay problem .
Step 1: In-depth electrical diagnosis
Using a multimeter, our technician measured the supply voltage. Result:
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240 V available at the compressor input.
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But no output voltage to the fan.
This lack of voltage confirmed a burnt out starter relay on the electronic board .
The control board was carefully disassembled, cleaned with dry air, and then tested on our portable bench.
Step 2: Relay replacement and recommissioning
We replaced the power relay with a genuine Fujitsu part and then performed a full functional test :
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Power on and synchronize with the indoor unit.
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Checking the compressor and fan start-up .
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Suction and discharge pressure control.
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Measurement of the blowing temperature inside: 9°C, a sign of optimal cooling.
The outdoor unit has returned to stable and quiet operation , despite the constraints of a restricted urban environment.
Step 3: Recommended Preventive Maintenance
Taking advantage of the intervention, we carried out a complete cleaning of the external coil, often clogged with urban dust and debris.
We also checked the insulation of the refrigeration pipes , which are particularly exposed to UV rays and bad weather.
Recommendations to the client:
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Schedule a professional cleaning every spring .
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Check that the unit remains clear of any obstacles (plants, bags, tools).
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Avoid covering the heat pump in winter with non-breathable tarps.
These simple actions ensure maximum energy efficiency and extend the life of the compressor.
A local service from AirGreen
This type of intervention perfectly illustrates the reality of urban installations: little space, but a lot of precision.
Our technicians are trained to work safely, even in demanding environments such as the balconies of the Plateau, the terraces of Mile-End or the narrow facades of Verdun .
Thanks to our experience, we guarantee fast, durable repairs that comply with Fujitsu standards .
A heat pump ready to face summer
At the end of the visit, the customer found a perfectly functioning system . His Fujitsu wall-mounted heat pump now ensures constant comfort, whether in air conditioning or heating mode.
Once again, our rigorous approach has made it possible to avoid unnecessary replacement and to bring a device back to life while still performing well.
At AirGreen , every repair is an opportunity to demonstrate our technical expertise and our commitment to the lasting comfort of Montrealers.
Whether in Montreal, Laval, Longueuil, the North Shore or the South Shore , we offer repair, maintenance and installation services for HVAC systems suitable for all residential environments.