Repair of a Gree wall-mounted heat pump in Sainte-Thérèse

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:

• The outdoor unit, securely attached to the brick wall, made no operating noise , while the indoor fan was running normally.

• A slight electrical clicking sound came from the control box.

• 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:

• Replaced the Schrader valve with a new Gree compatible model.

• Welded and sealed the connection to eliminate any risk of future leakage.

• Performed a rigorous vacuum draw to dry the circuit.

• 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:

• Stable pressure at 120 psi in cold mode.

• Indoor/outdoor temperature differential of 6°C in less than 5 minutes .

• 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 :

• Cleaning the external condenser to ensure optimal heat exchange.

• Checking the condensate drain and indoor air flow .

• 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 :

• Accurate and transparent diagnosis.

• Durable repair that complies with environmental standards.

• 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