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Réparation d’une thermopompe murale Daikin à Sainte-Julie
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Repair of a Daikin wall-mounted heat pump in Sainte-Julie

When a Daikin heat pump stops working properly: the service call in Sainte-Julie

At AirGreen , we often receive service calls related to performance issues or abnormal noise on outdoor units installed in semi-basements. This is exactly what happened in Sainte-Julie , on the South Shore of Montreal , where a customer contacted us regarding a Daikin wall-mounted heat pump that was no longer providing sufficient heat or cooling depending on the season.

The unit, installed under a concrete balcony, appeared protected, but this type of installation can also pose certain challenges—including restricted airflow and moisture buildup that eventually compromises the system's performance.

Complete diagnosis: check the evidence before disassembling

Upon our arrival, our technician performed a visual inspection of the Daikin heat pump. The outdoor unit was resting on a galvanized metal wall bracket, at a good height from the ground, but the surrounding concrete wall showed several cracks and signs of moisture. These elements, while not directly related to the breakdown, may indicate a harsh environment for electronic components .

We then have:

  • Checked the refrigerant pressure : a slight deficit was detected, confirming a microleak .

  • Tested the electronic card : no major defects.

  • Cleaned the condenser clogged with accumulated dust and dead leaves.

  • Inspected the refrigeration line (passing through the basement wall): aging and poorly sealed insulation, promoting a loss of efficiency.

Using our diagnostic tools, we located the leak at a flare fitting on the suction pipe—a typical failure point in older or poorly vibration-protected systems.

System repair and refurbishment

Once the leak is identified, we have:

  1. Tightened and resealed the fitting using a sealing compound specific to R-410A.

  2. Replaced the refrigeration line insulation to ensure better energy performance.

  3. Perform a complete vacuum draw to eliminate all traces of humidity in the circuit.

  4. Recharged the system with the exact amount of refrigerant recommended by Daikin.

  5. Tested the performance in both heating and cooling mode.

Result: the system regained its full power, quickly reaching the set temperature and reducing its operating cycle — a sign of restored efficiency.

The particularities of an installation under a balcony

Installing the condenser under a balcony or in a basement recess, as is the case here, offers some protection against the elements , but also presents risks:

  • Limited ventilation , causing the compressor to overheat in summer.

  • Stagnant humidity , promoting corrosion of components.

  • Difficulty of access for maintenance , which often results in a lack of periodic cleaning.

We therefore recommended that the customer add a side ventilation grille and plan for annual cleaning of the coil. This simple maintenance helps extend the life of the compressor and maintain optimal performance, especially in a humid climate like that of the South Shore .

AirGreen expertise: precise diagnosis and guaranteed sustainability

At AirGreen, we believe that a proper diagnosis is the key to a lasting repair. In this specific case, the microleak could have gone unnoticed for months if our technician hadn't taken the time to measure the actual pressures and superheat temperature .

This rigorous approach allows us to:

  • Repair instead of replacing , when economically justifiable.

  • Provide preventive solutions to avoid repeated breakdowns.

  • Ensure stable performance throughout the year.

Result: comfort restored and energy efficiency restored

Once the system was restarted, the customer immediately noticed an improvement in indoor comfort . The Daikin heat pump operated quietly, without temperature fluctuations or untimely cycles.

Thanks to this intervention, energy consumption has also decreased – a significant benefit at a time when electricity costs are rising.

In conclusion: an exemplary repair in Sainte-Julie

This Daikin wall-mounted heat pump repair in Sainte-Julie perfectly illustrates the importance of regular preventative maintenance and a thorough technical inspection . Even a still-functional installation can hide inefficiencies or minor leaks that could shorten the system's lifespan.

At AirGreen, we operate throughout Greater Montreal , including Laval , Longueuil , the North Shore and the South Shore , to provide our customers with reliable, efficient and durable HVAC systems — whether they are from Daikin, Gree, Fujitsu, Midea, or any other recognized brand.