A precision intervention in a bright living room
During this service call in Pointe-Claire , our AirGreen team was called to work on a Midea wall-mounted heat pump installed in a single-family residence on the ground floor. The customer reported that the system refused to start , accompanied by flashing lights on the indoor unit. This heat pump, a Midea Mission series model, provided both heating and cooling for the main space.
The unit was mounted above a decorative wooden partition separating the entrance from the living room, an environment where air circulation plays a key role in overall comfort. Our mission: to quickly identify the fault while respecting the space's meticulous finish.
Diagnosis: intermittent electronic failure
From the first minutes, we carried out an analysis of the error code displayed on the front: E1 , corresponding to a communication problem between the indoor unit and the outdoor compressor .
Before intervening, we carried out the following steps:
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Voltage test between terminals L1 and S on the control module.
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Inspection of connections in the outdoor junction box.
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Checking the continuity of the communication cable over a length of 15 meters.
The result: an unstable resistance value on the signal line, caused by oxidation of the connector on the outside. Humidity, combined with the temperature variations typical of Montreal's West Shore, had altered the contact.
Complete repair and signal optimization
We have proceeded to:
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Partial disassembly of the side panel to access the connector.
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Cleaning and treating the contact using a specialized dielectric product.
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Preventive replacement of the 14/4 cable with a UV and humidity sheathed model.
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Restart and synchronization between units via the Midea main module.
Once communication was reestablished, the heat pump restarted normally. The start-up and defrost cycles were tested several times to confirm the stability of the electronic board .
Additional adjustments for optimal comfort
Taking advantage of the visit, we also:
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Cleaned the air filters and ambient temperature sensor.
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Measured the blowing temperature , stabilized at 18.5°C for a set point of 23°C.
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Readjusted the level of the wall console , slightly tilted forward, which encouraged excessive condensation.
These minor interventions ensure extended service life and increased energy efficiency , while reducing the risk of noise or condensate leaks.
Precise work in a delicate residential environment
Working in a residential space requires more than just a repair: it's a balance between efficiency and respect for the home . Our technician protected the surrounding surfaces (wood and blinds) before any work and ensured that the unit was returned to pristine condition upon completion.
This meticulous approach illustrates our commitment: to offer professional and discreet HVAC service , whether in an urban condo, a suburban home or a Montreal duplex .
Final result: comfort restored and reliability assured
After the final tests:
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No flashing lights ; stable communication.
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Smooth and quiet cooling cycle .
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Customer satisfied with the speed and precision of the service.
The Midea wall-mounted heat pump has regained its full performance, ensuring constant comfort in the living room bathed in natural light.
AirGreen: the benchmark in heat pump repair in Montreal and on the West Shore
This intervention in Pointe-Claire demonstrates our expertise in repairing Midea systems , renowned for their efficiency but sensitive to communication anomalies. At AirGreen, we diagnose, repair and optimize each system to guarantee performance, silence and durability .
Our teams cover all of Greater Montreal, Laval, the North Shore and the South Shore , ready to intervene quickly for any repair or maintenance of wall-mounted, central or multi-zone heat pumps .