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Réparation d’un climatiseur mural Sanyo au Plateau-Mont-Royal
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Repair of a Sanyo wall-mounted air conditioner in Plateau-Mont-Royal

AirGreen intervention: precise diagnosis and restart of an old compact wall system

In the charming Plateau-Mont-Royal neighborhood, where old buildings mingle with contemporary renovations, we were called for HVAC repair service on a Sanyo wall-mounted air conditioner installed under an awning, above a balcony door.
This type of installation, typical of multi-family buildings in central Montreal, presents particular challenges: restricted space, limited ventilation and difficult access for maintenance.

Context of the service call

The customer contacted us after noticing that his air conditioner had stopped blowing cold air since the beginning of the summer season. Despite several attempts to reset the circuit breaker, there was no flow of cool air inside.
The outdoor unit, a 9,000 BTU wall-mounted Sanyo model , appeared visually intact, but emitted a dull, irregular noise upon startup.

The device's location – recessed under a dark gray painted exterior ceiling – posed a risk of heat and moisture buildup, both of which were aggravating factors for the internal electronic components.

In-depth diagnosis: a methodical approach by AirGreen

Our technicians carried out a complete inspection in several stages:

  1. Electrical circuit check : 240V power supply was stable and electrical connections intact.

  2. Control panel inspection : The main circuit board showed discoloration and a slight burning smell—a typical sign of a power surge.

  3. Fan motor test : after measuring the resistance, the motor was deemed functional, which directed our diagnosis towards the control board .

  4. Compressor relay check : no response from the relay, confirming a board fault.

  5. Drainage and coil inspection : slight accumulation of dust and debris, likely due to elevated location and lack of regular cleaning.

The verdict: defective electronic card causing a communication failure between the indoor and outdoor modules.

Repair and recommissioning

Once the fault was confirmed, we undertook the complete replacement of the control board with an original Sanyo compatible module.
This intervention, although delicate due to the height and limited space, was carried out with all necessary precautions:

  • complete power cut;

  • safe disconnection of connectors and relays;

  • installation of the new module and tightening of the fasteners.

After turning the power back on, the air conditioner started up again immediately. We checked:

  • starting the compressor and fan;

  • the pressure of R-410A refrigerant ;

  • the temperature difference between the blown air and the ambient air.

The result: smooth, quiet operation and instant return of cold air inside.

Maintenance and prevention tips for built-in installations

At AirGreen , we emphasize the importance of annual preventative maintenance , especially for units like this one, installed in closed corners.
Our recommendations for this type of installation:

  • Clean the outdoor coil twice a year to prevent overheating.

  • Check that the exhaust vents around the unit are not blocked.

  • Avoid storing any objects or vegetation in the immediate vicinity.

  • Consider, in the long term, replacing with a more recent wall-mounted heat pump (for example, the Gree Vireo+ R32 series), offering higher efficiency and quieter operation.

AirGreen Expertise: When Experience Meets Precision

This project in Plateau-Mont-Royal perfectly illustrates the versatility of our HVAC technicians .
Working on an older device like a wall-mounted Sanyo requires:

  • perfect knowledge of old generation control circuits;

  • an ability to diagnose without a recent pattern;

  • and a constant concern for safety in tight environments.

Thanks to our intervention, the client was able to regain optimal comfort without replacing his entire system, thus extending the lifespan of his device by at least a few years.

AirGreen, your HVAC partner in Montreal and throughout Greater Montreal

Whether your device is an old wall-mounted Sanyo , a Sharp ZU1 , or a modern R-32 Midea , our teams travel quickly to Montreal, Laval, Longueuil, the North Shore and the South Shore for any type of repair or maintenance.
Each AirGreen intervention is based on the same pillars: rigor, transparency and sustainability .

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