A Tell-Tale Service Call: An Old Wall-Mounted Air Conditioner Showing Signs of Failure
At AirGreen , we often receive calls for Sanyo wall-mounted air conditioners that have been installed for more than 10 or 15 years in homes and condos in Côte Saint-Luc . These units, renowned for their robustness at the time, inevitably end up showing signs of wear. This is exactly the case for our client today, the owner of a charming condo located near Pierre Elliott Trudeau Park.
The customer contacted us after noticing that the air blown by his wall unit was lukewarm , even when setting the temperature to the lowest setting. In addition, a slight metallic vibrating noise accompanied the compressor startup. With Montreal's summer temperatures, it was essential to intervene quickly.
Initial diagnosis: a progressive failure of the compressor and the electronic card
Upon our arrival, our certified technician performed a complete diagnosis of the HVAC system . The indoor unit, a wall-mounted Sanyo SAP series , was displaying an intermittent error code indicating a communication problem with the outdoor unit.
Here are the main steps of our inspection:
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Electrical circuit check : the supply voltage was stable at 240 V, excluding a power supply problem.
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Communication test between units : intermittent signal on the control line, typical symptom of an aging electronic card .
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Compressor inspection : after measuring the starting current, we observed an excessive draw of 12 A , indicating compressor fatigue .
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Refrigerant check : the level was slightly low, but with no apparent leaks - a sign that the loss was gradual, probably linked to the age of the circuit.
Our conclusion: The failure was caused by a dual electronic and mechanical problem — the outdoor unit's control board was no longer properly regulating the compressor, causing overheating and overall system inefficiency.
Technical intervention: temporary recommissioning and replacement recommendation
To provide immediate relief to the customer, we have carried out:
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a complete cleaning of the interior coil ,
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tightening electrical connections ,
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cleaning the temperature sensors ,
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and manual restart of the compressor after a circuit board reset.
These actions partially restored the air conditioner's operation . However, given the unit's age—approximately 17 years —and the limited availability of Sanyo parts , we recommended a complete system replacement with a Midea 12,000 BTU wall-mounted heat pump using R-32 refrigerant , which is much more efficient and environmentally friendly.
The result: restored comfort and optimized energy efficiency
After explaining to the customer the benefits of upgrading to a modern, high-efficiency unit , we scheduled the installation of a new system for the following week.
In the meantime, the customer was able to regain a certain level of air conditioning , sufficient to maintain a stable temperature around 23°C.
Once the replacement is complete, the new system will offer:
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reduced energy consumption by up to 35% ;
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stable performance even in extreme heat ;
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a noise level below 22 dB ;
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and a full 10-year warranty on parts and compressor.
This case perfectly illustrates AirGreen's philosophy: diagnose accurately, repair rigorously, advise honestly.
AirGreen Tips: Extend the Life of Your Wall-Mounted Air Conditioner
To avoid costly breakdowns and extend the life of your HVAC unit, we recommend:
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An annual professional maintenance , including cleaning, fluid check and performance test.
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Monthly cleaning of the filters , especially in summer.
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A minimum clearance of 15 cm around the indoor unit to ensure optimal air circulation.
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A wiring inspection every 3 to 5 years to prevent false contacts.
Why choose AirGreen for your HVAC repairs in Montreal, Laval and the South Shore
Our technicians work every day in the Côte Saint-Luc , Laval , Longueuil and all over the North Shore and South Shore of Montreal . Thanks to our experience with the Sanyo, Fujitsu, Gree, Midea, Sharp and Hitachi brands, we are able to respond quickly to all types of breakdowns: refrigerant leaks, defective electronic cards, compressor failures, drainage or ventilation problems .
By choosing AirGreen, you benefit from:
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of a precise and transparent diagnosis ;
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fast and local service ;
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a guarantee on repairs carried out ;
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and professional support for any energy replacement or upgrade project.
Conclusion: A trusted HVAC service in Côte Saint-Luc
Every repair we carry out in Côte Saint-Luc or elsewhere in Greater Montreal is an opportunity to demonstrate our commitment to quality, reliability and lasting comfort .
With our highly trained team, homeowners can always count on AirGreen to bring their HVAC systems back to life , whether it's minor repairs or complete replacements.