Accurate diagnosis of loss of performance in air conditioning mode
At AirGreen , we are often called upon for service calls related to performance losses on wall-mounted HVAC systems , especially during the first warm spells of the season. This summer, our team was called to Sainte-Julie , on the South Shore of Montreal , to work on a Gree wall-mounted heat pump that was no longer cooling the residence properly.
Symptoms reported by the client
The owner, attentive to the maintenance of his appliance, contacted us after noticing that the interior temperature no longer fell below 24°C, despite a setting of 20°C. The signs observed:
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Slightly cool but insufficient air coming out of the indoor unit.
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Extended cooling cycle without reaching the setpoint.
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No alarm visible on the display.
Upon our arrival, we took an initial measurement of the blowing temperature using an infrared thermometer : 15.6°C . This data indicated that the compressor was working, but that the system was not delivering its full cooling capacity.
Complete HVAC System Inspection
Our technicians undertook a multi-step diagnosis to identify the cause of this drop in performance.
1. Checking the filters and the internal exchanger
The filters were clean, but a slight deposit of dust had accumulated on the evaporator fins. This type of fouling, even slight, can already reduce the efficiency of an appliance by 10 to 15%.
2. Analysis of the refrigeration cycle
Using our electronic pressure gauges, we measured:
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Suction pressure slightly lower than normal,
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Condensing temperature too low,
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No abnormal condensate flow.
These readings pointed to a slightly low refrigerant level , likely caused by a microleak in the copper line.
3. Leak detection and leak testing
Using an electronic leak detector, we confirmed a micro-leak at the base of the flare fitting located near the outdoor unit. This type of leak, small but constant, perfectly explains a gradual loss of efficiency over the seasons.
Repair Steps
Once the source was identified, we carried out a complete repair:
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Safe disconnection of the refrigerant line.
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Remanufacture of the flare fitting and replacement of the seal.
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Complete vacuum for 45 minutes to dry the circuit.
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Recharge the system with the exact amount of R410A recommended by the Gree manufacturer.
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Complete cleaning of the evaporator using a specialized AirGreen biodegradable product.
Post-repair performance verification
Once the system was restarted, we resumed the infrared measurement:
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Outlet air temperature: 7.1°C (compared to 15.6°C before the intervention).
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Ambient temperature difference of more than 9°C in 20 minutes.
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Balanced pressures and stable cooling cycle.
These results confirmed the return to optimal performance. Interior comfort was immediately restored , with a constant noise level and energy consumption in line with the manufacturer's specifications.
Advice given to the client
To ensure the longevity of the system, our technician recommended:
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A complete maintenance every spring , including pressure check, cleaning and leak test.
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Never turn off the power supply during the winter, in order to preserve the electronic defrosting circuits.
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Maintain a clear space around the outdoor unit, especially during hot periods.
AirGreen Expertise: Precision and Reliability on the South Shore
This Gree wall-mounted heat pump repair in Sainte-Julie perfectly illustrates the AirGreen method:
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A rigorous diagnosis supported by professional measuring instruments.
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Safe interventions that comply with HVAC industry standards.
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Measurable and immediate results for each client.
At AirGreen, we operate throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore , for the maintenance, repair and installation of wall-mounted, central and multi-zone heat pump systems of all brands.
Conclusion
Through a methodical inspection and targeted repair, our team restored this Gree heat pump to its original performance, ensuring the customer a comfortable summer without overconsumption. Each AirGreen intervention is carried out with the same promise: efficiency, transparency and sustainability .