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

A precise diagnosis for restored comfort

At AirGreen , every service call is handled with the same technical rigor and attention to detail. This call came from a customer living in Sainte-Dorothée, Laval , who noticed that his Gree wall-mounted heat pump was no longer cooling his living space effectively. Despite a setting of 20°C, the room remained warm and uncomfortable.

Upon arrival, our certified technician undertook a complete analysis of the system . Using a precision infrared thermometer , the air outlet temperature was measured at 16.1°C , an abnormally high value for an optimal cooling cycle.

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Step 1: General Operation Inspection

Before any intervention, it is essential to observe the overall behavior of the heat pump.
Our technician carried out the following checks:

• Ambient and blowing temperature : confirming an insufficient difference for good performance.

• Condition of the interior filters : slight clogging, contributing to the reduction in air flow.

• Outdoor unit condition : No visible obstructions, but the condenser required a thorough cleaning.

• Checking the electronic card and the temperature sensor : correct operation, no anomalies detected.

These initial findings led the diagnosis towards a loss of performance linked to the refrigeration cycle .

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Step 2: Diagnosis of the refrigeration circuit

To confirm this hypothesis, we connected our pressure gauges and checked the pressures of the R410A refrigerant.
Result: Low pressure too low , indicating a minor refrigerant leak in the circuit.

Our experts then carried out:

• A nitrogen leak detection test ;

• A careful visual inspection of flare connections and welds ;

• A preventive tightening of certain connection points .

A micro-leak was identified at the suction pipe union at the wall head. After repair and re-welding, we performed a complete vacuum , then recharged the circuit to the exact amount specified by Gree .

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Step 3: Recommissioning and final checks

Once the heat pump was restarted, the blowing temperature gradually dropped:

• First minute: 15°C

• Third minute: 11°C

• Fifth minute: 8.5°C

Cooling performance has therefore returned to an optimal level , ensuring a temperature difference of more than 10°C between the intake air and the blown air, which perfectly corresponds to the performance standards of Gree wall-mounted heat pumps.

The customer immediately noticed the difference: fresher air, quieter operation, and restored comfort throughout the home.

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Step 4: Recommended Preventive Maintenance

We advised the client to adopt an AirGreen annual maintenance plan , including:

• Complete cleaning of filters and coils ;

• Checking the refrigerant level ;

• Checking electrical connections and condensate drain ;

• Inspection of motorized shutters for a homogeneous air flow.

This regular monitoring helps extend the life of the system while maintaining maximum energy efficiency , thus reducing electricity costs.

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Exemplary AirGreen service in Sainte-Dorothée

This service call perfectly illustrates AirGreen 's philosophy:
diagnose accurately, repair sustainably, and ensure the long-term comfort of our customers.

Thanks to our expertise in HVAC system repair in Montreal, Laval, Longueuil, on the North Shore and the South Shore , we intervene quickly to restore your Gree, Fujitsu, Midea, LG, Sharp or Trane equipment to its original performance.

At AirGreen, every intervention is more than just a repair: it's a guarantee of comfort, reliability and energy efficiency .

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AirGreen Air Conditioning & Heating – Your trusted HVAC partner in Laval and throughout Greater Montreal.