Service call for a Fujitsu wall-mounted heat pump in Sainte-Julie

A delicate intervention in a narrow stairwell

At AirGreen , we recently received a service call for a Fujitsu wall-mounted heat pump installed in a residential stairwell in Sainte-Julie , on Montreal's South Shore. This type of installation, while discreet and efficient, often presents unique challenges for maintenance and repair, particularly due to the height and limited access to the indoor unit.

Symptoms reported: decreased performance and intermittent noise

The customer reported a decrease in airflow and a slight vibrating noise when the system switched from heating to cooling mode. In an environment where air circulation is essential to distribute the temperature evenly across multiple floors, these symptoms could indicate:

• a clogged filter ;

• an unbalanced blower wheel ;

• or wear of the ventilation motor .

Our certified technicians carried out a complete inspection of the Fujitsu wall-mounted heat pump , model from the LZAS range , well known for its energy efficiency and reliability in multi-level residences.

Accurate diagnosis and safety above all

Given the height of the unit, our team secured the area with a stable platform ladder and safety harness before undertaking any work. After removing the front cover, we noticed a significant accumulation of dust on the evaporator as well as a slight misalignment of the tangential fan , causing the reported noise.

A thorough cleaning was therefore carried out:

1. Complete cleaning of the evaporator with dry steam and biodegradable product;

2. Replacing the fan and checking the imbalance ;

3. Cleaning of air filters and disinfection of the condensate tray;

4. Pressure and temperature test to confirm proper operation of the refrigeration cycle.

Result: restored performance and optimal comfort

Upon restart, the Fujitsu heat pump demonstrated restored air circulation and quiet operation , a sign of perfect mechanical balance. The customer immediately noticed a significant improvement in comfort in the stairwell, with better temperature distribution between floors.

Thanks to this intervention, the heat pump has regained optimal energy efficiency , guaranteeing long-term savings on the electricity bill.

AirGreen expertise at the service of complex installations

Installations in stairwells or restricted access areas require specific technical expertise and appropriate safety tools . At AirGreen, our technicians are trained to operate in these environments without compromising the safety or integrity of the system.

What sets AirGreen apart:

• Precise on-site diagnosis and secure interventions ;

• Complete cleaning with biodegradable and certified products;

• Balancing and calibration of mechanical components;

• Fast service throughout the South Shore, Montreal and Laval .

Recommended preventive maintenance

To prevent this type of problem from recurring, we recommended annual preventative maintenance to the customer, including:

• cleaning the evaporator and condenser ;

• checking the air flow and the ventilation motor ;

• refrigerant level control ;

• and cleaning of condensate drains .

This preventative approach is particularly important for Fujitsu wall-mounted installations , as dust and vibration accumulate more quickly in vertical traffic areas such as stairwells.

AirGreen: your HVAC partner in Sainte-Julie and throughout the South Shore

At AirGreen, we combine technical expertise, rigor, and attention to detail to provide high-quality HVAC repair and maintenance services. Whether you're in Sainte-Julie, Longueuil, Brossard, or on the North Shore, we provide fast, efficient, and safe repairs on all Fujitsu, Gree, Midea, Sharp, Hitachi, Bosch, and other models.

Warning: Any repair involving the disassembly or recharging of a refrigeration system must be carried out by a qualified technician holding an RBQ and CCQ license.