An urgent service call during a heat wave in Montreal
On a particularly hot day in Outremont , a customer contacted us because their Sharp Eco Inverter wall-mounted heat pump no longer seemed to be cooling efficiently. The indoor unit, although running, was only producing a lukewarm breeze. Faced with this loss of performance, our team of AirGreen experts quickly arrived on site to diagnose the cause of the problem.
Initial diagnosis: inconsistent temperatures at the air outlet
Upon our arrival, our technician checked the blowing temperatures using a professional infrared thermometer . The temperature measured at the unit outlet was 20.3°C , whereas in air conditioning mode, it should have been between 11°C and 14°C depending on the ambient conditions. This data immediately confirmed a lack of refrigerant or a disturbed refrigeration cycle .
Thorough inspection of the installation
The outdoor unit, a Sharp Plasmacluster Eco Inverter model, had dust buildup on the condenser coil and slight oxidation on the copper fittings . Using an electronic leak detector, our technician located a microleak at the liquid line flare , a critical point often affected by repeated thermal cycling and natural vibration of the equipment.
Repair and recommissioning steps
To restore optimal system operation, our team performed the following steps:
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Complete recovery of R-410A refrigerant present in the system using certified recovery equipment.
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Repair of the defective flare fitting : recutting the tubing, reshaping the cone and installing a new flare with sealing ring.
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Leak test under nitrogen at 300 psi for 45 minutes — result: no pressure change detected.
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Deep vacuum down to -30 inHg to remove all traces of moisture.
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Recharge R-410A refrigerant according to the factory charge recommended by Sharp (1.1 kg).
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Performance check : balanced pressures, blowing temperature at 12.8°C — a sign of perfect heat exchange.
Result: immediate comfort and restored performance
Once the leak was repaired and the charge restored, the Sharp heat pump resumed normal operation. The room reached the set temperature in less than 25 minutes , with stabilized power consumption and minimal noise levels . The customer, who was worried about having to replace his unit, was able to see that a quick and targeted intervention was enough to restore the original performance .
AirGreen expertise: precision, transparency and reliability
This type of intervention demonstrates the importance of a rigorous and methodical diagnosis . At AirGreen , we use advanced measuring instruments—digital pressure gauges, infrared thermometers, electronic leak detectors—to quickly identify the exact cause of a breakdown.
Our technicians follow certified protocols for each step: refrigerant recovery, silver brazing, leak testing and recommissioning in compliance with Quebec environmental standards.
Preventive maintenance: the best protection against leaks
We strongly recommend a complete annual maintenance of each wall-mounted heat pump, especially Sharp Eco Inverter models. This maintenance includes:
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Cleaning the indoor and outdoor coil .
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Checking the refrigerant pressure .
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Inspection of flare and electrical connections .
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Cleaning the condensation drain to prevent overflow.
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Checking the operation of the inverter compressor and the temperature sensor.
Regular maintenance not only helps prevent breakdowns, but also maintains the appliance's optimal energy efficiency , thus reducing electricity costs in the long run.
AirGreen, your HVAC partner in Montreal and throughout the North Shore
Whether you are in Outremont , Laval , Longueuil or elsewhere in Greater Montreal , our team is ready to intervene for any type of wall-mounted heat pump repair , regardless of the brand: Sharp, Fujitsu, Gree, Midea, Hitachi, Zephyr, Goodman and many others.
Every AirGreen service is built on three pillars: transparency, quality, and reliability . We explain each step of the diagnostic process, clearly present repair options, and guarantee our work.
This Sharp wall-mounted heat pump repair in Outremont perfectly illustrates the difference between a simple surface inspection and a complete professional intervention . Thanks to our expertise, the client regained the comfort of their home—and the peace of mind that comes with a well-performing, well-maintained HVAC system.