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

When a high-performance system loses its efficiency: an exemplary AirGreen intervention

In the heart of the North Shore, in Boisbriand , our team was called to diagnose a performance problem on a Sharp ECO Inverter wall-mounted heat pump , installed several years ago in a single-family residence. This model, renowned for its Plasmacluster Ion technology and its excellent efficiency/silence ratio, had recently been showing signs of weakness: loss of heat, irregular cycles and unusual fan noise .

The context of the service call

The customer contacted us after noticing that, despite being set to 24°C, the indoor temperature no longer exceeded 19°C. In addition, the outdoor unit seemed to be running continuously , a classic sign of a performance issue or a lack of refrigerant.

On site, our technicians immediately noticed that the outdoor unit was installed under a wooden deck, which was partially protected but sometimes restricted air circulation. The restricted space could cause heat and condensation to build up , which puts more pressure on the compressor.

Step 1: Complete System Diagnosis

At AirGreen, every HVAC service call begins with a structured analysis of the system's thermal and electrical performance . Our technicians therefore:

  • checking the refrigerant circuit pressures ;

  • measuring the supply voltage ;

  • reading internal Sharp error codes , accessible via the electronic card interface;

  • and a visual inspection of the fan and interior turbine .

The readings quickly revealed a slightly lower-than-standard pressure —a clear indicator of a micro-leak of R-410A refrigerant . A closer look revealed small traces of oil at the flare connection between the outdoor unit and the refrigerant line.

Step 2: Repair and Recharge the System

Once the leak was identified, our team undertook the following fixes:

  1. Tightening and re-machining of the flare fitting , to ensure a perfect seal;

  2. Nitrogen leak test , to confirm the absence of new leaks;

  3. Complete vacuuming of the circuit , guaranteeing the purity of the system before recharging;

  4. Accurate refill with R-410A refrigerant , according to Sharp brand specifications;

  5. Complete cleaning of the condenser to improve heat dissipation.

Thanks to these operations, the heat pump regained nominal pressure values ​​and smooth operation upon restart.

Step 3: Adjusting the operating mode

Our technicians also made an adjustment to the operating mode : the machine was previously operating on an “Auto” cycle with frequent transitions between heating and cooling, causing premature wear of the compressor . We therefore advised the customer to maintain the heating mode constant during the cold season, a key recommendation for Sharp heat pump owners.

Results: comfort restored and performance optimized

A few minutes after restarting, the difference was evident:

  • hot air flow increased by 30%;

  • electricity consumption has decreased;

  • and the compressor noise level returned to normal.

The client noticed an immediate return of comfort and improved temperature stability throughout the house.

AirGreen Recommendations: Maintaining a Sharp Heat Pump on the North Shore

Sharp ECO Inverter heat pumps are renowned for their reliability and energy efficiency, but like any HVAC system, they require rigorous maintenance to maintain their efficiency. We recommend our customers:

  • have the system inspected every year before winter;

  • clean the internal filters every four to six weeks;

  • clear the area around the outdoor unit , particularly under closed structures (terraces, balconies);

  • and listen carefully for any changes in compressor sound , often the first sign of a problem.

These preventive actions extend the life of the compressor and ensure consistent performance, even during the harsh Quebec winters.

AirGreen: your trusted HVAC partner in Boisbriand and throughout Quebec

At AirGreen, every repair is an opportunity to demonstrate our commitment to quality and durability . Our certified technicians respond quickly in Montreal, Laval, Longueuil, on the North Shore and the South Shore , whether for:

  • repairs to Sharp, Fujitsu, Midea or Gree wall-mounted heat pumps ;

  • complete preventive maintenance ;

  • or custom installations adapted to the Quebec climate .

We combine in-depth technical expertise with impeccable customer service , ensuring every home enjoys optimal comfort all year round .

Conclusion: A repair that brings home comfort back to life

This intervention in Boisbriand perfectly illustrates how a micro refrigerant leak , often invisible, can compromise the performance of a heat pump known for its efficiency. Thanks to a rigorous diagnosis and meticulous execution, our team was able to restore the performance of this Sharp ECO Inverter , ensuring the customer warmth and serenity for many seasons to come.