A typical Montreal service call: when a Sharp unit decides to take a break
At AirGreen , we regularly receive service calls from the charming red brick plexes of the Rosemont–La Petite-Patrie neighborhood. That day, a customer contacted us about a Sharp Multi Inverter wall-mounted heat pump that had stopped providing cold air during the warm spring months. The installation, mounted on a typical Montreal back wall, was already showing some signs of wear, but nothing that couldn't be refurbished by our specialized HVAC repair technicians in Montreal .
Initial diagnosis: loss of performance and intermittent noise
Upon arrival, we conducted a complete inspection of the Sharp system . The customer reported two symptoms:
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Warm air in air conditioning mode , despite an audible compressor.
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Intermittent metallic noise coming from the outdoor unit.
After taking pressure measurements and checking the electrical connections, our technicians quickly noticed an abnormal drop in the pressure of the R-410A refrigerant , accompanied by a slight leak on a solder joint in the copper circuit connecting the indoor unit to the outdoor unit.
Repair carried out: soldering, cleaning and complete recalibration
The first step was to precisely locate the leak . Using an electronic detector and a nitrogen test, we confirmed the leak on a poorly insulated copper elbow located at the wall outlet.
We then have:
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Cut and re-welded the defective section using high strength silver solder.
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Cleaned the Sharp Multi Inverter condenser coils to remove accumulated dust that was restricting heat transfer.
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Performed a complete vacuum draw of the circuit to eliminate all traces of humidity.
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Recharged the system with R-410A refrigerant , according to Sharp manufacturer's specifications.
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Checked voltage, starter relay and electronic control board.
Once everything was finished, we turned the system back on: the pressure stabilized , the cold air flow was optimal and the noise completely disappeared .
Technical Explanation: The Critical Role of Solders and Insulation
This case perfectly illustrates a common problem in Montreal: leaks in pipes that are poorly protected against temperature fluctuations and humidity . On exposed brick walls, copper joints undergo constant freeze/thaw cycles. Without adequate insulation and solid attachment points, microcracks can appear, leading to gradual gas loss and a decrease in energy performance.
Our technicians therefore applied high-density insulating foam to protect the new solder joints, thus ensuring increased longevity of the Sharp system .
Result: comfort restored and efficiency restored
After our intervention, the Sharp Multi Inverter heat pump returned to its original performance. The customer immediately noticed:
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An interior temperature stabilized in less than 15 minutes.
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Power consumption reduced by almost 20% according to the monitoring module.
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A silent and stable outdoor unit on its supports.
We also took the time to explain to the customer some good maintenance practices , including cleaning the internal filter and annually checking the external fittings to prevent any recurrence.
Why trust AirGreen for Sharp heat pump repair
Our interventions are distinguished by:
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Complete expertise on Sharp, Gree, Fujitsu, Midea and other major brand systems .
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Certified technicians capable of quickly diagnosing any fault related to the compressor, the electronic card or the refrigeration circuit.
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Fast service covering Montreal, Laval, Longueuil, the North Shore and the South Shore .
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A transparent approach: clear estimate, technical explanations and follow-up after repair.
AirGreen Tips: Prevent Leaks and Extend the Life of Your Heat Pump
To avoid failures similar to the one encountered in this Rosemont project, we recommend:
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Annual visual inspection of exterior refrigeration ducts.
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Check airflow and clean coils before the hot season.
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Monitoring for abnormal noises (clicking, whirring, whistling).
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Professional maintenance every two years to ensure proper operation of the compressor and inverter module.
Regular maintenance extends the life of your device and guarantees optimal performance, summer and winter.
A repair by AirGreen: speed, precision and satisfaction
This intervention perfectly illustrates our mission: to provide reliable, precise and sustainable HVAC service in Montreal and its surrounding areas . Thanks to our team, this Sharp Multi Inverter heat pump continues to maintain consistent comfort in a typical Rosemont–La Petite-Patrie building today—proof that proper maintenance and rigorous diagnostics can extend the life of an HVAC system by several years.