Loss of performance in the middle of summer: a typical case of an inactive compressor
At AirGreen , we were contacted by a homeowner in Sainte-Thérèse , on the North Shore of Montreal , whose Gree Inverter wall-mounted heat pump was no longer cooling his home properly. The customer noticed that the indoor unit was blowing lukewarm air despite a constant demand for air conditioning, a typical problem with an HVAC system losing pressure or with a blocked compressor .
Step 1: Initial check and on-site diagnosis
Upon our arrival, our RBQ certified technician performed a complete inspection of the Gree installation:
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The outdoor unit, securely attached to the brick wall, made no operating noise , while the indoor fan was running normally.
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A slight electrical clicking sound came from the control box.
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The refrigeration circuit pressure was abnormally low, which confirmed a partial loss of refrigerant .
After turning off the power, we opened the service panel and observed signs of corrosion on the Schrader valve , a sign of a slow leak that had developed over time.
Step 2: Leak Detection and Repair
To confirm the hypothesis, we injected a tracer gas (nitrogen + UV tracer) into the circuit and used our electronic leak detector .
Result: the leak was indeed coming from the high pressure service connection .
We then have:
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Replaced the Schrader valve with a new Gree compatible model.
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Welded and sealed the connection to eliminate any risk of future leakage.
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Performed a rigorous vacuum draw to dry the circuit.
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Recharged the system with the exact amount of R410A refrigerant according to the manufacturer's specifications.
Step 3: Restart and Check Performance
Once the system was recharged, we carried out a controlled start-up of the Gree Inverter compressor . The measurements taken were optimal:
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Stable pressure at 120 psi in cold mode.
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Indoor/outdoor temperature differential of 6°C in less than 5 minutes .
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No abnormal noise or excessive vibration.
The outdoor unit resumed its smooth and quiet operation, characteristic of recent Gree models.
Step 4: Cleaning, Calibration and Preventive Maintenance
We took advantage of the intervention to carry out a complete interview :
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Cleaning the external condenser to ensure optimal heat exchange.
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Checking the condensate drain and indoor air flow .
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Temperature sensor test and electronic controller recalibration.
We advised the customer to perform an annual maintenance before each summer season to prevent dust accumulation and degradation of pressure seals.
Step 5: Results and Customer Feedback
After our intervention, the Gree heat pump regained its full cooling and heating capacity . The owner noted an immediate return to indoor comfort and a decrease in electricity consumption measured on his panel.
Why entrust your repairs to AirGreen?
This case demonstrates the expertise of our teams specialized in the repair of wall-mounted Inverter HVAC systems :
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Accurate and transparent diagnosis.
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Durable repair that complies with environmental standards.
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Absolute compliance with safety and energy performance protocols.
We respond quickly throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , for your Gree, Fujitsu, Midea, Sharp, or Goodman heat pumps .
AirGreen – Gree wall-mounted heat pump repair experts in Sainte-Thérèse
✅ Fast and certified diagnosis
✅ Leak repair and refrigerant recharge
✅ Complete residential and commercial HVAC service