When the reliability of an HVAC system depends on meticulous maintenance
In a quiet residential neighborhood of Fabreville , Laval , our AirGreen team was recently called to diagnose a Koolking wall-mounted heat pump installed on a wooden deck. The customer was noticing a gradual loss of performance , particularly in air conditioning mode, accompanied by an irregular clicking noise coming from the outdoor unit.
This situation perfectly illustrates the importance of regular maintenance—especially when equipment is exposed to the humidity and temperature variations typical of Quebec.
Background and initial observations
Upon arrival, we noticed that the outdoor unit was sitting directly on a wooden platform, without anti-vibration pads. Slight traces of corrosion were visible on the mounting screws and refrigerant line outlets. These details, while minor, can quickly turn into performance issues.
The customer, who had been using this Koolking heat pump for over six years, had recently noticed a decrease in fresh air flow and an abnormal increase in his electricity bill.
Complete technical diagnosis
Our team undertook an in-depth diagnosis to identify the exact source of the failure:
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Fan and Motor Inspection : The outdoor fan was running erratically, indicating a weakened start capacitor .
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Checking the refrigerant circuit pressures : the measured values were lower than the Koolking manufacturer's standards - a typical symptom of a slow refrigerant leak .
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Nitrogen leak detection and electronic detection : a micro-leak was detected on a slightly oxidized brazing of the gas return pipe .
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Control board check : although functional, the board showed surface oxidation due to humidity, requiring preventive cleaning.
Repair and recommissioning
Once the diagnosis was confirmed, we undertook the complete repair, step by step:
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Replacement of defective capacitor , original Koolking part.
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Repaired the leak by copper brazing and tested for leaks under nitrogen at 300 psi.
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Complete vacuum for 45 minutes to ensure a perfectly dry and airtight circuit.
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Recharge R-410A refrigerant according to the model's technical specifications.
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Cleaning and anti-corrosion treatment of exterior surfaces and electrical connections.
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Installation of anti-vibration pads to limit sound transmission to the wooden terrace.
Each step was carried out in accordance with the strictest HVAC protocols, ensuring safety, reliability and long-lasting performance.
Result: comfort restored and operation optimized
After restarting, the Koolking heat pump regained stable pressure, a cold blowing temperature and normalized power consumption. The clicking noise had disappeared, replaced by smooth and quiet operation .
The client quickly noticed a significant improvement in interior comfort, especially during the hottest hours of the day.
AirGreen Maintenance Recommendations
To extend the life of this type of HVAC system, especially when installed outdoors on a deck or balcony, we recommend:
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Clean the condenser fins at each change of season.
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Check refrigeration connections for oil or corrosion.
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Install rubber pads or isolated mounts to reduce vibration.
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Carry out an annual professional maintenance , including pressure measurement and electrical check.
These simple actions prevent the majority of common breakdowns and guarantee stable performance throughout the year.
AirGreen expertise in Laval and throughout metropolitan Quebec
At AirGreen , we put our know-how at the service of the repair, maintenance and installation of HVAC systems throughout the metropolitan region of Montreal, Laval, Longueuil, the North Shore and the South Shore .
Each service call is an opportunity for us to demonstrate our technical rigor , our respect for brands like Koolking, Midea, Fujitsu, Lennox or Zephyr , and our commitment to restoring comfort sustainably .