An accurate diagnosis for a faulty Sanyo wall-mounted air conditioner
At AirGreen , we were recently called to intervene in a residence in Sainte-Julie , on the South Shore of Montreal , for a Sanyo wall-mounted air conditioner that refused to start. The customer, who had been using this unit for several years, had noticed that despite the indicator lights being on, no air circulation was occurring. This is a typical case where HVAC repair expertise takes on its full importance.
Initial inspection: an old but robust device
The model installed was a single-zone wall-mounted Sanyo from the “Eco-Comfort” series, a reliable and very common appliance in homes built in the early 2010s.
Our technician first performed a complete visual inspection , including:
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The condition of the air filter and intake grille.
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The electronic control panel (main board).
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The interior fan motor .
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The electrical connection between the wall unit and the outdoor compressor.
Within the first few minutes, we detected an anomaly in the fan motor start relay , a common fault in older Sanyo models.
Diagnosis confirmed: faulty blower relay
The interior fan, although mechanically functional, was no longer receiving the necessary voltage to start. By testing the electrical signals emitted by the control board, our technician confirmed that the internal relay was burned out , preventing the motor from starting.
This failure caused incomplete cooling : the compressor operated, but cold air remained trapped in the evaporator, which could eventually cause frost buildup.
AirGreen Repair: Relay Replacement and Complete Maintenance
After customer approval, we replaced the defective relay with a compatible original part. To ensure long-term reliability, we also:
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Cleaned the evaporator coil with a biodegradable product to remove dust and microorganisms.
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Checked the R410A refrigerant pressure and adjusted the level slightly to optimize energy efficiency.
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Disinfected the condensate drain and checked that the water was draining properly.
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Tested the control board after repair to ensure electrical signal stability.
Once restarted, the Sanyo wall-mounted air conditioner resumed normal operation: a powerful, quiet and even airflow.
Result: restored efficiency and immediate comfort
The customer immediately noticed a rapid drop in temperature and a return to the expected comfort. Thanks to precise repair and comprehensive maintenance, we were able to extend the life of the system without requiring a complete replacement.
We also took the time to advise the owner on some good maintenance practices suitable for Sanyo systems:
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Clean air filters every month during the summer.
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Leave the fan running for a few minutes after the compressor stops to remove any residual moisture.
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Schedule annual preventative maintenance before the hot season.
AirGreen expertise on the South Shore
Each intervention carried out by AirGreen is based on three principles: technical rigor , transparency and personalized service .
Our technicians, trained to RBQ and CCQ standards, work on all types of wall-mounted appliances — Sharp, Fujitsu, Gree, Sanyo, Midea, Lennox, Bosch , and more — throughout the Montreal Metropolitan Area , including Laval, Longueuil, the North Shore and the South Shore .
This case in Sainte-Julie illustrates our approach: methodical analysis , original parts , and service focused on lasting performance . Even a device over ten years old can regain its efficiency with expert intervention.
Why choose AirGreen for your HVAC repairs?
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Fast and local service : intervention possible in less than 24 hours in several sectors.
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Certified and experienced technicians .
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Complete transparency on costs and diagnostics.
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Warranty on parts and labor .
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Personalized advice to extend the life of your device.
We know that a broken wall-mounted air conditioner can quickly disrupt the comfort of a home. That's why we always prioritize repair before replacement , whenever possible, to reduce costs for the customer while maintaining optimal performance.
A repair that extends the life of your system
Following the repair, the Sanyo air conditioner in Sainte-Julie was restored to working order, with improved efficiency and air circulation. The customer regained immediate comfort , while avoiding the major expense of premature replacement.
This type of intervention demonstrates AirGreen 's ability to bring old wall-mounted appliances back to life, while respecting the highest standards of the HVAC sector in Quebec.