A complex service call for a compressor failure on a Midea central unit
At AirGreen , we are often called upon to work on Midea central heat pumps installed in single-family homes in Laval and the North Shore. On this day, our technical team traveled to Sainte-Dorothée , a peaceful residential neighborhood known for its spacious homes and efficient HVAC systems. The client contacted us after noticing that their central heat pump was no longer producing heat despite the apparent operation of the outdoor fan.
Accurate diagnosis of a compressor failure
Upon our arrival, we carried out the usual checks: supply voltage, circuit continuity and visual condition of the condenser. Quickly, an abnormal noise and the absence of pressure in the refrigeration lines confirmed our suspicions: the compressor was no longer starting .
We then removed the side panel to access all the internal components—the fan, condenser, and refrigeration circuit. This inspection revealed a burnt-out compressor and a damaged start capacitor , two problems often associated with prolonged electrical overload.
The steps of repair
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Insulation and recovery of R410A refrigerant in accordance with current environmental standards.
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Complete replacement of the compressor with an original Midea model compatible with the BTU capacity of the system.
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Cleaning and flushing the refrigeration circuit to remove burnt oil residue.
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Installed a new starting capacitor and filter drier to ensure long-lasting performance.
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Nitrogen pressure test to check for leaks, followed by a complete vacuum before refrigerant recharging.
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Electronic calibration and performance test after system restart.
Results: comfort restored and efficiency regained
Once the heat pump was restarted, the customer was able to observe stable blowing and a consistent indoor temperature from the first few minutes. The readings taken confirmed balanced pressure and a coefficient of performance in accordance with Midea specifications .
Thanks to methodical intervention and original parts, we restored the system's energy performance while extending its lifespan .
AirGreen tips to avoid this type of breakdown
Compressor failure is often the result of neglected preventative maintenance . At AirGreen, we recommend:
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A complete annual inspection of the central heat pump (cleaning of coils, pressure and condensate control).
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Periodic replacement of the internal filter to ensure optimal airflow.
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Installation of an electrical protection system (surge or time delay relay) to avoid overloads.
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Check the refrigerant level at each maintenance, since a lack of fluid increases the stress on the compressor.
AirGreen expertise in Laval and on the North Shore
Our RBQ and CCQ certified technicians work every day in Laval, Montreal, Longueuil, the North Shore and the South Shore , on all makes and models of HVAC systems. Whether for a quick diagnosis , an urgent repair or a complete replacement , we provide professional, transparent and sustainable service.
This repair in Sainte-Dorothée perfectly illustrates our commitment: to extend the useful life of Midea equipment while optimizing occupant comfort .