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Réparation d’une thermopompe murale Sharp à Saint-Léonard
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Repair of a Sharp wall-mounted heat pump in Saint-Léonard

A service call for a noisy and inefficient wall unit

At AirGreen , every service call on a wall-mounted heat pump is an opportunity to restore comfort and tranquility to homes in the greater Montreal area. This service call in Saint-Léonard involved a Sharp wall-mounted heat pump , installed in a narrow hallway serving the bathroom and kitchen. The customer contacted us after noticing two issues: an unusual noise when it was turned on and a loss of efficiency in air conditioning mode .

Diagnosis: Dirt buildup and minor leak

Upon arrival, we performed a complete diagnostic of the unit. The Sharp wall unit, although still functional, showed several typical signs of insufficient maintenance:

  • A mechanical noise coming from the interior fan.

  • A slight smell of damp dust when starting.

  • Uneven cooling in adjacent rooms.

Upon disassembling the upper casing, we discovered a significant accumulation of dust and mold on the evaporator coil , as well as the beginnings of a leak on the suction tube connection, visible using an electronic refrigerant detector. This microleak was causing a gradual drop in pressure, compromising the performance of the outdoor compressor.

Step 1: Complete cleaning and disinfection

Cleaning a wall system requires thoroughness and care. We have:

  1. Removed and cleaned the washable filters with a biodegradable disinfectant solution.

  2. Applied an antibacterial product to the evaporator coil.

  3. Cleaned the fan impeller (often overlooked, but a major source of odors).

  4. Drained and rinsed the condensate drain to remove deposits obstructing the flow.

These steps not only restore indoor air quality, but also reduce vibration noise and performance losses.

Step 2: Repair the leak and recharge the refrigerant

Once the cleaning was complete, we precisely located the leak on the suction hose flare connection . The seal was slightly loose, causing a loss of refrigerant gas.

So we have:

  • Tighten the connection to the tightening torque recommended by Sharp.

  • Pulled a full vacuum to -500 microns.

  • Recharged the circuit with R410A refrigerant according to the unit's nominal capacity (9,000 BTU).

  • Checked the stability of suction and discharge pressures.

After these operations, the initial noise had disappeared and the blown air reached 17°C in air conditioning mode , confirming a return to full efficiency.

Step 3: Calibration of the motorized shutter and final test

The horizontal motorized shutter had a slight offset, preventing proper air distribution. After calibration via the remote control, the airflow was redirected evenly, ensuring a constant temperature in the hallway, kitchen, and adjoining bathroom.

We concluded with a comprehensive performance test :

  • Noise level: reduced from 42 to 32 dB.

  • Airflow: normalized to 100%.

  • Static pressure: meets Sharp specifications.

Result: efficiency and comfort restored

At the end of the intervention, the customer noticed rapid cooling of his home and remarkable silence of operation . The Sharp system returned to its full capacity, while consuming less energy.

The intervention was carried out according to AirGreen standards:

  • Use of genuine Sharp parts .

  • Complete cleaning without unnecessary disassembly.

  • Guarantee on the recharge and the sealing of the repaired connection.

At AirGreen, we work on all types of residential HVAC systems in Montreal, Laval, Longueuil, on the North Shore and the South Shore .
Our goal: to extend the lifespan of your devices and maintain stable comfort throughout the year, thanks to precise diagnostics and certified repairs .