Diagnosis and recommissioning of a Sharp Eco Inverter system in winter
At AirGreen , we were recently called to Sainte-Dorothée, Laval, for a service call on a Sharp Eco Inverter wall-mounted heat pump . The customer noticed that their heating system was blowing lukewarm air, unable to maintain the desired temperature inside, despite a seemingly working outdoor unit. This type of call is common in late fall and early winter, when outdoor conditions put a strain on systems.
Inspection and initial findings
Upon arrival, our technicians immediately performed a visual and functional inspection of the system. The outdoor unit, a Sharp Eco Inverter with Plasmacluster Ion technology , showed partial frost buildup on the coils , a typical symptom of an ineffective defrost cycle. The unit, still powered, appeared to be working, but without producing sufficient heat inside.
We connected our AirVac digital manifold to take an accurate reading of the refrigerant circuit pressures . These measurements are essential for understanding the behavior of the compressor and refrigerant, especially when the outside temperature is low.
Detailed diagnosis
The pressure readings revealed an imbalance between the low and high pressure side , suggesting a lower than normal refrigerant level . This situation can be caused by:
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a microleak in the circuit connections,
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a pressure loss due to a poorly sealed previous installation,
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or even a slow leak on the service valve.
To confirm the hypothesis, we used an electronic leak detector and sprayed a foaming solution on the flare fittings. Bingo—small bubbles formed on the suction hose connection, confirming a microleak at the lower flare .
System repair and recharge
After isolating and purging the circuit , our team disassembled the defective section, re-flared it with a calibrated tool , and then applied a gasket to the exact torque recommended by Sharp . This precision is essential: too much tightening can crack the tube, too little can cause a future leak.
Next, we performed a complete vacuum to remove all traces of moisture and air from the system. Once the pressure was stable (30-minute test at -760 mmHg), we recharged the circuit with R-410A refrigerant according to the manufacturer's specifications .
A comprehensive performance test then confirmed compressor stability, efficient defrost cycles and energy efficiency in line with manufacturer standards.
Results and customer satisfaction
As soon as it was restarted, the customer immediately noticed the difference: stable hot air flow, quickly reached interior temperature, and restored silence . We took the time to explain good maintenance practices, including:
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clean the internal filters every two weeks,
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check the clearance around the outdoor unit ,
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avoid the accumulation of snow or ice on the condenser .
Thanks to this intervention, the Sharp heat pump regained all its energy efficiency , ensuring comfort and savings for the rest of the winter.
AirGreen expertise at your service
This case perfectly illustrates the rigor of our approach to HVAC repair . At AirGreen, we always favor a precise diagnosis before any intervention , because each system, even of the same brand, reacts differently depending on its environment and its maintenance history.
Our certified technicians work daily in Montreal, Laval, Longueuil, on the North Shore and the South Shore , for the repair and maintenance of Sharp, Fujitsu, Gree, Midea and other heat pumps . We use calibrated measuring tools and proven procedures to ensure the durability and performance of your HVAC systems.
Why choose AirGreen for your Sharp heat pump repairs?
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Precise on-site diagnosis with professional instruments.
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Repairs guaranteed and in accordance with manufacturer recommendations.
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Certified technicians specializing in popular residential brands in Montreal.
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Fast service available 7 days a week.
In winter as in summer, a Sharp heat pump well maintained by AirGreen guarantees you optimal comfort and reduced energy consumption .