When a minor breakdown threatens summer comfort
A resident of Sainte-Julie , on Montreal's South Shore , contacted us after noticing that his ComfortStar Inverter wall-mounted heat pump was no longer cooling his living room effectively. Although the outdoor unit appeared to be working—the fan was running and no unusual noises were audible—the air expelled inside remained lukewarm. This is a common situation in early summer, often linked to a lack of maintenance or an imbalance in refrigerant pressure.
Initial Inspection of the ComfortStar Heat Pump
At AirGreen , every diagnosis begins with a methodical approach. After powering down the system, our technician checked the following points:
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Electrical voltage and power supply: The wall circuit breaker was intact, with no signs of overload.
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Outdoor compressor condition : No excessive vibration or visible oil leaks.
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Refrigeration piping : presence of abnormal condensation near the flare connections.
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Operating pressures : A noticeable underpressure immediately confirmed a partial lack of R-410A refrigerant .
This observation pointed us towards a slow micro-leak , common on wall systems installed for more than 5 years.
Diagnosis confirmed: micro-leak and internal fouling
When opening the indoor unit, our technician discovered a double cause:
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A slight leak at the flare connection , probably due to repeated thermal expansion.
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An evaporator clogged with a thin layer of dust and grease, reducing heat exchange.
This dual problem explained both the loss of cold and the higher energy consumption observed by the customer.
Complete on-site intervention
To restore the performance of the ComfortStar Inverter , we proceeded to:
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Precise location of the leak using an electronic tracer and a soap test.
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Tightening the flare fitting , followed by replacement of the gasket.
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A complete vacuum of the refrigeration circuit to eliminate any residual humidity.
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An R-410A refrigerant recharge calibrated to the appliance's specifications.
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A complete cleaning of the evaporator and the interior fan , using a certified biodegradable product.
Total duration of the intervention: approximately 2 hours , without the need for complete dismantling.
Immediate result: efficiency restored and customer reassured
Once the system was restarted, the temperature readings showed:
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Ambient air: 24°C
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Air leaving the indoor unit: 8°C
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Thermal differential: 16°C , indicating optimal performance.
The customer immediately noticed a marked difference in the comfort of their main room. Additionally, the outdoor compressor was now running more quietly, indicating adequate refrigerant charging and restored airflow.
Recommended preventive maintenance
At AirGreen , we emphasize the importance of regular HVAC system maintenance to avoid this type of breakdown. For ComfortStar heat pumps, we recommend:
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Cleaning the filters every 6 weeks during the summer.
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An annual professional inspection in the spring to check pressures and leaks.
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Clearing exterior ducts : avoid leaves, cobwebs or objects blocking ventilation.
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Checking the wall mount : ensure that the anchors and silent blocks absorb vibrations correctly.
These simple actions extend the life of the heat pump and prevent performance losses.
AirGreen: your trusted partner on the South Shore
As HVAC repair and maintenance experts, we operate daily in Sainte-Julie, Boucherville, Longueuil, and Brossard . Our certified technicians are fully familiar with ComfortStar, Gree, Fujitsu, Sharp, Midea, and Goodman systems and are equipped to diagnose any type of problem—whether it's a faulty circuit board, a refrigerant leak, a blocked fan, or a sensor issue.
Our goal: to quickly restore your comfort while extending the life of your system. Each intervention is documented, measured, and carried out in accordance with the standards of the Quebec Building Code and the Ministry of the Environment 's guidelines for the safe handling of refrigerant gases.
AirGreen — Repair and maintenance of wall-mounted heat pumps in Montreal, Laval, Longueuil, North Shore and South Shore.
Sustainable solutions, guaranteed comfort.