Repair of a Tosot wall-mounted heat pump in Chomedey

A service call in an underground parking lot in Laval

In the Chomedey area of ​​Laval , our AirGreen team was recently called out to address a problem with a Tosot wall-mounted heat pump installed in the underground parking lot of a residential building. This type of installation, common in modern condos, often presents unique challenges: limited ventilation, constant humidity, and temperature fluctuations that can affect the performance of the outdoor unit.

Initial diagnosis: abnormal noise and loss of efficiency

The customer had noticed an intermittent metallic noise coming from the outdoor unit as well as a drop in heating efficiency . Upon our arrival, we carried out a series of checks:

• Complete visual inspection of the Tosot unit;

• Checking the support suspended from the ceiling, typical of underground garages;

• Airflow and fan speed analysis;

• Pressure and temperature test on the refrigeration circuit.

Our technicians quickly discovered that the external fan was vibrating excessively , causing not only the reported noise, but also poor heat dissipation . Further inspection revealed that the fan was slightly out of balance due to a buildup of dust and metal deposits on the blades.

AirGreen intervention: precision and safety above all

Working in an underground parking lot requires specific safety measures:

• Use of a mobile scaffold suitable for work at height;

• Check ventilation to avoid any accumulation of refrigerant gas;

• Compliance with the electrical disconnection protocol in confined spaces.

After securing the area, we:

1. Cleaned and balanced the fan ;

2. Tightened the anti-vibration fixings fixed to the concrete slab;

3. Checked the level of R-410A refrigerant , conforming to the Tosot model;

4. Tested performance in heating and cooling mode to ensure proper overall operation.

Result: restored silence and optimal performance

At the end of the intervention, the Tosot heat pump returned to its original operating silence . Pressure and temperature measurements indicated excellent system stability , confirming that the compressor had not suffered any damage despite the temporary imbalance.

The customer, impressed by the speed and accuracy of the service, noted that he had never seen a technician check so many parameters for a simple vibration. At AirGreen, we believe that every detail counts —especially in an environment as delicate as an underground garage where noise easily reverberates.

What this Tosot repair reminds us of

Wall-mounted heat pumps installed in underground spaces require special attention:

• Ambient humidity can accelerate corrosion;

• Vibrations propagate more in concrete structures;

• Limited access complicates maintenance if the supports are not well designed.

This is why we recommend to all building owners and managers:

• To plan preventive maintenance twice a year;

• To check the stability of the suspended supports ;

• To maintain good air clearance around the condenser ;

• Call a certified professional in case of noise, odor or visible leak.

AirGreen expertise at your service throughout Greater Montreal

Whether in Montreal , Laval , Longueuil , on the North Shore or the South Shore , our specialized technicians work daily on Tosot, Gree, Fujitsu, Midea, Sharp and many other systems. Each intervention is documented, calibrated and validated according to the strictest standards in the residential and commercial HVAC field.

By choosing AirGreen, you benefit from local expertise , fast service and a transparent approach based on the sustainable performance of your equipment.