A typical Montreal service call: a heat pump struggling to heat as winter approaches
At AirGreen , we receive numerous calls each fall from customers who notice a decline in the performance of their wall-mounted heat pump . This is the case for this brick residence located in Sainte-Anne-de-Bellevue , on the West Island of Montreal. The installation, a compact Midea model, provided the main heating for the ground floor—until the owner noticed that the outdoor unit was no longer generating heat and was making an irregular noise.
On-site diagnosis: a communication problem between the card and the compressor
Upon our arrival, we carried out a series of checks:
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Electrical inspection : correct supply voltage and working circuit breakers.
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Reading the error code displayed on the indoor unit: signal indicating a loss of communication between the control board and the inverter compressor .
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Compressor test : resistance within the norm, but no start-up at the signal from the card.
Our diagnostic quickly confirmed that the outdoor unit's main board was faulty. This type of problem is common after several years of exposure to temperature and humidity fluctuations, particularly in installations located near brick walls where heat dissipates less quickly.
Intervention: replacement of the electronic card and calibration of the system
We completely replaced the control board with an original Midea part, supplied by our distribution partner in Montreal. Here are the steps of the intervention:
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Power off and remove the condenser front .
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Removing the faulty card and cleaning the oxidized connectors.
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Installing the new board with checking the pressure sensor and thermistor connectors.
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System restart and inverter module calibration to ensure smooth compressor modulation.
Results: Restored performance and a satisfied customer
After power was restored, the heat pump immediately resumed normal operation. The compressor was modulating smoothly again, and the hot air flow rate was measured at 43°C at the indoor outlet—a performance that was fully within the manufacturer's specifications.
The customer noted a significant reduction in outside noise , demonstrating smooth operation. Before our departure, we cleaned the coils, checked the R-32 refrigerant pressure, and reminded the customer of the importance of annual preventative maintenance to extend the life of their unit.
AirGreen expertise serving homes in Montreal and the North/South Shore
Midea heat pumps are renowned for their reliability and energy efficiency. However, like any HVAC system, they require regular maintenance. At AirGreen, our approach is based on:
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Accurate diagnosis using calibrated measuring equipment.
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Exclusive use of original parts .
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Rapid intervention covering all of Greater Montreal: Laval, Longueuil, North Shore, South Shore .
Every repair is also an opportunity to optimize the system's comfort and durability. In this case, we added a red protective duct to harmonize the installation with the brick facade and protect the refrigeration lines from freezing and physical damage.
Maintenance tips to prevent electronic breakdowns
A circuit board is sensitive to heat, humidity, and power surges. To avoid this type of problem:
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Clean the interior filters every 4 to 6 weeks.
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Keep the outdoor unit clear of leaves, snow and debris.
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Have the wiring and connections inspected at least once a year.
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Protect the installation with a suitable differential circuit breaker or surge protector.
By following these recommendations, it is possible to extend the life of a Midea wall-mounted heat pump well beyond ten years, while maintaining optimal energy efficiency.
Conclusion: AirGreen, your trusted partner for HVAC repair
The intervention in Sainte-Anne-de-Bellevue perfectly illustrates AirGreen's philosophy: to offer a transparent, technical and sustainable service , focused on customer satisfaction and the performance of HVAC systems.
Whether it's an electronic problem, a refrigerant leak, or complete maintenance, our team operates throughout Montreal and its surrounding areas to ensure comfort, safety, and energy efficiency.