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

Precision work on a narrow balcony in Montreal

At AirGreen , we regularly receive calls for wall-mounted heat pumps installed on balconies , often in typical Montreal residential buildings. This type of installation, although common, requires specific expertise: limited access, risks of humidity, reduced air circulation.

This is precisely the case of our intervention in Outremont , where a Gree wall-mounted heat pump located on a small concrete balcony had an intermittent breakdown : the outdoor unit refused to start at times, leaving the apartment without air conditioning in the middle of the summer heat.

Diagnosis: A moisture-related power supply problem

During our inspection, we noticed several worrying elements:

  • The outdoor unit, a 12,000 BTU Gree model, was installed in the immediate vicinity of the balcony's downspout, exposed to water infiltration.

  • The electrical connection box showed traces of moisture and oxidation on the contact terminals.

  • The unit's service panel also showed a slight deposit of dust and rust, a sign of accelerated aging.

Our electrical tests revealed that the voltage was fluctuating between 118V and 130V, causing internal safety cutouts in the heat pump control module.

Intervention: complete cleaning and securing of the wiring

We started the repair by proceeding with:

  • A complete cleaning of the electrical compartment of the outdoor unit with a specialized dielectric product for HVAC equipment;

  • Replacement of the wall circuit breaker and outdoor junction box, which had been affected by moisture;

  • Re-insulation of power wires using heat-shrink tubing and self-fusing tape;

  • A complete test of the compressor and fan, confirming that both components were still in good condition.

To prevent the issue from recurring, we added a rain cover over the enclosure and advised the customer to keep the area clear of any objects (including a winter tool that was partially blocking the ventilation).

Result: Stabilized system and restored performance

Once the wiring was cleaned up and the connections secured, the heat pump restarted without hesitation . The refrigeration pressures were stable, the compressor was operating normally, and the indoor blower temperature reached 19°C after only ten minutes of operation.

The relieved customer immediately felt the difference: reduced noise, regular airflow, and consistent air conditioning throughout the home.

Preventive maintenance tips for balcony installations

Our technicians reminded the owner of some essential best practices for installations in confined spaces:

  • Keep a minimum clearance of 30 cm around the outdoor unit;

  • Avoid placing objects on the condenser , even temporarily (tools, planters, etc.);

  • Check the electrical box every spring for corrosion;

  • Clean the condenser fins with low pressure compressed air to maintain optimum performance.

AirGreen: Your Trusted HVAC Service Partner in Montreal

This repair demonstrates the importance of rigorous and professional HVAC service , especially in urban environments where installation conditions can affect the longevity of the units.

At AirGreen , we operate in Montreal, Laval, Longueuil, on the North Shore and the South Shore , with recognized expertise on all the major brands: Gree, Fujitsu, Midea, Lennox, Trane, Bosch, Goodman , and many others.

Our certified technicians ensure fast, durable and safe interventions , whether for an urgent repair , preventive maintenance or a complete installation .

Technical details of the intervention

  • System type: Gree wall-mounted heat pump

  • Capacity: 12,000 BTU

  • Problem: Intermittent failures due to moisture in the electrical box

  • Solution: Cleaning, replacing the circuit breaker, insulating the wiring, restart testing

  • Result: Stabilized tension, restored performance, assured comfort

Conclusion

Thanks to our meticulous intervention, the Outremont client's Gree heat pump has regained its reliability. This case perfectly illustrates the need for rigorous maintenance of installations exposed to the outdoors , and the added value of an AirGreen certified service to preserve your comfort all year round.