Summer comfort interrupted in a condo in the heart of Outremont
Summer is in full swing in Montreal, and wall-mounted air conditioners are working hard to provide the comfort expected in urban apartments. It was in this context that our AirGreen team was called to intervene in an Outremont condo , where a Fujitsu wall-mounted air conditioner suddenly refused to blow cold air, despite a seemingly normal display on the remote control.
Symptoms reported by the client
The client had noticed several worrying signs:
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The indoor fan was running , but the air remained lukewarm.
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After a few minutes, the operating light was flashing without the machine responding to commands.
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No noise from the external compressor was noticeable.
A typical problem is an indoor unit that is not communicating well with its condenser, or a faulty control board .
Diagnosis: Identify the cause of the lack of cooling
Upon our arrival, we carried out a complete three-step diagnosis .
1. Checking the interior panel
The Fujitsu wall unit, installed high up near the ceiling, had light dust buildup on the fins and a flap that only opened halfway .
First we have:
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Removed the cover to inspect the air filters and internal sensors .
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Thoroughly cleaned the filters and the room temperature sensor.
However, the problem did not appear to be related to a mechanical obstruction.
2. Checking communication with the outdoor unit
Using our dedicated Fujitsu tester, we noticed a loss of communication signal between the two units. The status LEDs on the indoor unit indicated an “E:EE” error, corresponding to a link or power board fault.
We then measured:
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Stable supply voltage at 240V , confirming that the current was arriving correctly;
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But a lack of voltage return on the control terminals , a sign of a problem on the internal electronic card.
3. Inspection of the control card
After disassembling the front panel, our technician found a trace of oxidation on the circuit board , caused by condensation that had accumulated over time.
This phenomenon is common in apartments with high humidity where condensate drainage is not optimal.
Repair: replacement of the electronic card and adjustment of the drainage
The intervention consisted of:
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Replace the main control board with a genuine Fujitsu part, compatible with the ASU12RLF model.
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Tighten communication connections securely and add insulating protection to prevent future infiltration.
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Clean the condensate tray and reposition the drain pipe to ensure smooth drainage.
After complete reassembly, we ran a 20-minute full cooling test .
Result :
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The compressor activated immediately.
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The air outlet temperature dropped to 7.6°C , confirming optimal performance.
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No error lights were flashing, and the system was operating in automatic mode.
Results and customer satisfaction
The owner, who was worried about having to replace his entire device, was relieved to learn that a card replacement was all that was needed .
We also reprogrammed the remote and explained how to watch for warning signs of a communication fault, including:
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Unusual flashing of the lights;
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Warm blown air despite active cold mode;
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No noise from the outdoor condenser.
AirGreen Tips to Extend the Life of a Fujitsu Wall-Mounted Air Conditioner
Our experts recommend:
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Cleaning the filters every two months during the summer season.
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Professional annual maintenance , including refrigerant check and turbine cleaning.
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Drainage monitoring , particularly in older buildings in Outremont where walls can retain moisture.
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Installation of an electronic moisture barrier in areas with high condensation.
AirGreen expertise at your service in Outremont and throughout Montreal
At AirGreen , we make it a point of honor to ensure the lasting comfort and energy performance of each device.
Whether it's a wall-mounted heat pump, a Fujitsu, Midea, Gree, Lennox or Mitsubishi air conditioner , our certified technicians master advanced diagnostic protocols to guarantee precise and lasting repairs in Montreal, Laval, Longueuil and on both shores.