When a breakdown occurs at the worst possible time: a fast and efficient service call from AirGreen
At AirGreen , we know that a wall-mounted heat pump plays a vital role in daily comfort, especially when it regulates both the heating and cooling of a Montreal home. Recently, we were called for a repair service in an apartment in Montreal's Côte-des-Neiges neighborhood. The customer had noticed that their wall-mounted Midea unit was no longer blowing cool air, despite the power indicator being on.
Initial diagnosis: misleading symptoms
Our technician quickly arrived on site. Upon entering, the situation was clear: the indoor unit, installed above the doorframe of a small hallway, was operating without producing any cooling.
An initial check confirmed that:
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the indoor fan was running properly,
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the operating indicator was stable,
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but the blowing temperature remained identical to that of the room.
This indicated that the problem was not a simple adjustment, but rather an inactive refrigeration circuit .
Step 1: Checking the communication module
Since the Midea heat pump was connected to an outdoor compressor via an electronic module, our technician checked the communication board . Using a multimeter, he measured the voltage between terminals 2 and 3: no response. This observation pointed the diagnosis towards a faulty main board in the indoor unit.
Step 2: Inspecting the signals and the PCB
After securing the unit, we opened the top panel and examined the PCB (Printed Circuit Board). There was some light oxidation near the power connector, likely caused by condensation that had accumulated over time.
We cleaned the board, tightened the connections and restarted the unit: still no response from the outdoor compressor. The fault was therefore confirmed - faulty main board .
Step 3: Replacement and restart
AirGreen has an excellent stock of parts for Midea heat pumps , so our team was able to replace the board the next day.
Once the new card is installed:
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communication has been reestablished,
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the outdoor compressor started,
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and fresh air began to circulate in the hallway and adjacent rooms.
We then tested the unit in both modes—heating and cooling—to confirm stable operation and proper R-32 refrigerant pressure .
Technical analysis and tips to prevent similar failures
The cause of this failure was twofold:
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Accumulation of internal condensation , linked to poor drainage of condensates.
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Natural wear of electronic components after several heating and cooling cycles.
Our recommendations to the client:
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have the condensate drain checked at least once a year,
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keep the internal filters clean,
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and schedule a full maintenance in the spring and fall.
These simple actions extend the life of Midea wall systems and reduce the risk of breakdowns during peak seasons.
Why choose AirGreen for your HVAC repairs in Montreal
Our teams serve Montreal, Laval, Longueuil, the North Shore and the South Shore every day, with technicians specifically trained on Midea, Gree, Fujitsu, Sharp, and Goodman models.
We favor rapid, documented, and transparent interventions: the customer is always informed of the diagnosis before any repair.
Thanks to this approach, the Côte-des-Neiges family was back in comfort the next day, just in time for a predicted heat wave. Their Midea heat pump is now operating at full capacity, ensuring cool, stable air throughout the home.
In summary: this Midea heat pump repair demonstrates the importance of accurate diagnosis and regular preventative maintenance. At AirGreen , we are committed to providing sustainable solutions tailored to every home in Greater Montreal.