A service call for a troubled Mr. Slim heat pump
Recently, our AirGreen team was called to intervene in Boisbriand , on the North Shore of Montreal , for a performance issue on a Mitsubishi Electric Mr. Slim wall-mounted heat pump . The customer noticed that the outdoor unit seemed to be running continuously, but without producing enough hot air inside the residence. This type of symptom is common in the spring or fall, when temperature fluctuations put a strain on the systems.
Complete diagnosis on site
Upon our arrival, we carried out a detailed diagnosis .
Our technicians followed the following steps:
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Operating mode check : The system was stuck in "Auto" mode, causing it to alternate between heating and cooling.
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Inspection of the outdoor coil : moderate accumulation of dust and debris, limiting heat exchange.
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R-410A refrigerant pressure measurement : slightly lower than normal pressure, suggesting minimal charge loss.
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Wiring check : no signs of overheating, but a slightly oxidized communication connector between the indoor and outdoor unit.
This inspection determined that the loss of efficiency was due to an imbalance between the refrigeration charge and the unit's electronic control , a situation fairly typical of Mitsubishi Electric Mr. Slim models over five years old.
AirGreen intervention: precision and durability
Our technicians undertook a series of specific interventions to restore the system to full performance:
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Deep cleaning of the outdoor condenser using a gentle jet and biodegradable products specially designed for HVAC systems.
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Refill with R-410A refrigerant gas , according to the pressures recommended by Mitsubishi.
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Cleaning and anti-oxidation treatment of the communication connector , ensuring better synchronization between the two units.
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Checking defrost cycles to ensure optimal operation during colder nights.
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Complete performance testing : inlet and outlet temperatures, current draw, and energy efficiency verification (SEER/HSPF).
In less than two hours, the heat pump was back to full capacity, blowing stable and regular hot air.
AirGreen expertise at the service of residential comfort
At AirGreen, every wall-mounted heat pump repair is carried out with the same rigor and technical precision. Our certified technicians ensure not only the repair of the fault, but also the prevention of future failures .
In this specific case, we advised the owner:
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Clean the internal filters every 4 to 6 weeks.
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Avoid prolonged automatic mode , which unnecessarily wears out components.
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Opt for annual preventive maintenance before the heating season, in order to maintain maximum efficiency.
With these best practices, the lifespan of a wall-mounted heat pump can easily be extended by several years.
Result: restored efficiency and comfort regained
After our interventions, the results were immediately noticeable:
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Stable and uniform indoor temperature in all rooms.
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Reduction of external noise , a sign of a normalized compression cycle.
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Significant drop in electricity consumption , confirmed by customer readings a few days later.
This Boisbriand customer expressed his satisfaction with the speed of intervention and the quality of AirGreen monitoring . We scheduled automatic annual maintenance to ensure the longevity of his Mitsubishi system.
AirGreen: the HVAC benchmark on the North Shore and in Montreal
Whether it's a Mitsubishi Electric heat pump , a Fujitsu air conditioner , a Gree system , or a Sharp or Midea model , our team provides expert service throughout the greater Montreal area , including Laval , Longueuil , Boisbriand , Brossard , and Terrebonne .
Every AirGreen service call is based on:
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Complete transparency on diagnoses and costs.
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Genuine parts that meet manufacturer standards.
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Personalized monitoring adapted to the needs of each residential client.
In conclusion , this repair illustrates the excellence of our approach:
Rapid response, advanced technical expertise and a lasting commitment to customer satisfaction.