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Réparation d’une thermopompe murale Gree à Rosemère
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Repair of a Gree wall-mounted heat pump in Rosemère

A compressor at a complete standstill in the summer heat

On a particularly hot afternoon in Rosemère , on Montreal's North Shore , our AirGreen team was urgently called to a Gree wall-mounted heat pump that had completely shut down. The customer reported that no cooling was noticeable and that the outdoor unit remained silent, despite a normal display inside.

This type of breakdown, often linked to an electrical problem with the compressor , requires rapid intervention to avoid further damage.

First inspection: a revealing silence

Upon our arrival, our certified technician performed a visual and electrical check of the Gree outdoor unit. Upon removing the cover, we noted a complete lack of fan and compressor operation , while the control board appeared to be powered.

Using a digital multimeter , measurements revealed:

  • Correct supply voltage at 240 V;

  • No voltage output to the inverter compressor ;

  • Abnormal resistance on the starting capacitor .

The initial diagnosis pointed to a faulty capacitor , potentially accompanied by a problem on the power board .

In-depth diagnosis: continuity test and electronic card

To confirm, we performed a compressor continuity test . The windings showed balanced values, ruling out mechanical failure. The capacitor , on the other hand, showed no measurable capacitance—proof that it had reached the end of its useful life.

We then examined the power board (PCB) located next to the compressor module. There was evidence of overheating on the relay section, likely caused by repeated power surges.

Intervention: replacement and calibration

Our team undertook a double preventive intervention :

  1. Complete replacement of the starting capacitor with an original Gree model, rated at 45 µF / 450 V.

  2. Cleaning and inspection of the electronic card , with resoldering of the main relay and application of a protective insulating varnish.

During this operation, we also:

  • Cleaned the condenser fins ;

  • Checked the ground connections ;

  • Tested the fan resistance ;

  • Checked R-410A refrigerant levels to confirm system leak tightness.

Results: successful restart and optimal performance

Once the parts were replaced, we restarted the Gree heat pump. The compressor started immediately, accompanied by a smooth and quiet start of the fan .

Post-repair measurements showed:

  • Stable suction pressure at 120 psi;

  • Discharge pressure at 380 psi;

  • Indoor blowing temperature at 8.1°C.

The customer experienced immediate comfort and noted improved airflow and a reduction in overall noise.

Technical analysis: why does this breakdown occur?

Starting capacitors are essential, but fragile, components. They gradually deteriorate due to:

  • Frequent voltage variations (storms, unstable network);

  • Prolonged overheating on very hot days;

  • Accumulation of dust and moisture in the compressor compartment.

At AirGreen, we recommend having the capacitor inspected and tested every two years , especially on units installed in direct sunlight or without shelter.

AirGreen expertise: speed, precision, reliability

This intervention perfectly illustrates our approach: precise diagnosis, lasting repair, and integrated preventive maintenance . Our technicians are trained on all major brands— Gree, Midea, Fujitsu, Sharp, Zephyr, Trane, and many others —and have the necessary equipment to quickly identify electronic and mechanical faults.

Whether you are in Rosemère , Boisbriand , Laval or Montreal , our team will come to you quickly to repair, maintain or optimize your residential HVAC systems .

AirGreen Maintenance Tips to Extend the Life of Your Heat Pump

  • Have electrical connections inspected before each heating and cooling season.

  • Make sure the outdoor unit is free of leaves and debris .

  • Avoid extension cords: direct and dedicated connection only.

  • Schedule an annual AirGreen service for a complete cleaning and calibration.

Conclusion

Thanks to this rapid intervention in Rosemère, the Gree heat pump has regained all its power and efficiency. At AirGreen, we combine technical rigor and human service , guaranteeing our customers lasting and energy-efficient comfort throughout the year.