An urgent service call for a broken wall-mounted air conditioner
At AirGreen , we were recently called to intervene in a residence located in Ville Mont-Royal , where a Daikin wall-mounted air conditioner installed in a stairwell was no longer blowing cold air. With the arrival of a sudden heat wave in Montreal, the client noticed that the temperature upstairs was rising rapidly, despite the system's usual settings.
This wall-mounted installation, positioned high above the stairs, was a typical Daikin Comfort Series wall-mounted air conditioner . These units are renowned for their reliability, but their high location sometimes makes diagnostic and maintenance work more difficult.
Diagnosis: A stopped indoor fan and a faulty control board
Upon arrival, we first checked the essentials: power supply, remote control signal, and air return. The outdoor compressor was working normally, which indicated that the problem was with the indoor unit.
Upon climbing onto our specialized stepladder for high-rise installations, we noticed that the indoor fan was no longer spinning at all , although the operating LED was lit. After some electrical testing, our technicians confirmed that the control board (PCB) was no longer sending the necessary signal to the fan motor.
Possible causes:
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Recent electrical surge (frequent in Town of Mount Royal during storms).
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Accumulation of dust and moisture on the connectors, altering the circuit.
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Aging of electronic components after several years of use.
Complete repair and recommissioning of the wall-mounted air conditioner
We replaced the original Daikin circuit board with a new, approved part compatible with the Comfort series. Before restarting, the unit was completely cleaned: filters, coils, and condensate tray.
Once the card was installed, we rebooted the system and observed:
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Smooth start of the ventilation motor.
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A blowing temperature of 11°C , perfectly in line with Daikin standards.
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No abnormal noise, a sign that the motor and fan were intact.
The customer, impressed by the speed of the intervention, found optimal thermal comfort as soon as the service was completed.
Technical features of this installation in Ville Mont-Royal
Wall-mounted air conditioners installed in stairwells present a particular challenge:
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Cold air tends to sink quickly to the ground floor.
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Even diffusion requires precise calibration of the direction of the flaps.
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Maintenance is more complex due to the installation height.
Our AirGreen technicians use wireless diagnostic tools and secure telescopic stepladders , specially designed for this type of location. This allows us to intervene efficiently, without unnecessary dismantling or risk of damage to the wall.
AirGreen Tips to Extend the Life of a Wall-Mounted Air Conditioner
We remind our customers in Ville Mont-Royal , Montreal and the entire North Shore that preventive maintenance is essential to avoid this type of breakdown:
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Clean filters every 3 months (or more often if you have pets).
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Check condensate drains in spring and fall.
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Avoid power surges by using suitable electrical protection.
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Schedule an annual inspection with AirGreen, including refrigerant pressure testing and electronic board verification.
When to call AirGreen?
Signs that should alert you:
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The unit blows air, but not cooled.
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The light flashes without the system starting.
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An unusual noise appears inside or outside.
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The system starts, but shuts down after a few minutes.
In these cases, immediately contact AirGreen , your trusted HVAC company in Montreal, Laval, Longueuil, on the North Shore and the South Shore . Our teams will quickly come to you with the parts and equipment needed to restore your comfort, regardless of the brand of your appliance: Daikin, Fujitsu, Gree, Sharp, Midea, Bosch, Hitachi , and many others.
Final result: comfort and tranquility restored
Thanks to this intervention, the client in Ville Mont-Royal once again benefits from a high-performance and quiet system. Air circulation in the stairwell has become fluid again, ensuring thermal balance between the floors. The Daikin wall-mounted air conditioner was tested under different speeds and modes (cooling, dehumidification, ventilation): all parameters returned to normal .
At AirGreen , we believe that a well-executed repair should extend the life of a system rather than hasten its replacement. This is why each service call becomes an opportunity for us to combine technical rigor, efficiency and transparency .