A strategic intervention in a tight space
At AirGreen, we’re often called in to work in complex situations, where the architectural layout of a home demands special attention. That’s exactly what we faced during this service call in Bois-des-Filions, on the North Shore of Montréal. The client reached out to us about a Manuflow wall-mounted heat pump that had stopped functioning properly and had been making an unusual noise for several days.
This unit was installed in a narrow hallway, directly above an interior door and right next to the bathroom, which significantly limited access for a full inspection and repair.
Context of the intervention: initial diagnosis
Upon arrival, our team of certified HVAC technicians carried out a detailed assessment of the unit. The Manuflow model presented several concerning symptoms:
-
Intermittent shutdowns in heating mode, despite an ambient temperature below 19°C.
-
A metallic vibrating noise, noticeable even from the floor below.
-
No response from the infrared remote control, despite recently replaced batteries.
The location of the wall unit, nestled just above a doorframe, made technical handling more difficult—especially when trying to access the control board, the axial fan, and the stepper motor responsible for directing the airflow fins.
Troubleshooting steps and solution provided
1. Power cut and safe disassembly
We first isolated the unit from electrical power using the dedicated breaker. Then, using a compact step ladder, our technicians were able to reach the front panel and carefully remove the top and bottom covers of the heat pump.
2. Inspection of internal components
Once opened, the unit showed:
-
A significant buildup of dust in the fan compartment, partially blocking the motor.
-
A control board stained with condensation residue, likely due to poor moisture drainage.
-
Misaligned airflow fins causing abnormal friction.
3. Deep cleaning
The maintenance was carried out with care using non-corrosive products, including:
-
Degreasing of the fan and turbine.
-
Cleaning of the PCB (printed circuit board) with isopropyl alcohol.
-
Targeted vacuuming in the obstructed internal ducts.
Realignment and technical repair
The realignment of the airflow fins required precise calibration of the integrated servomotor, which had been partially disengaged due to prior vibrations. We then performed a continuity test, which allowed us to isolate a slightly loose cable in the signal connector between the main board and the IR receiver module.
Parts replaced:
-
1 startup capacitor (3.5 μF).
-
1 standard 3-pin IR connector.
-
1 high-density rubber fan mounting grommet.
Results of the intervention
After the full restart, the Manuflow unit was operating optimally again, with:
-
Noise reduction of over 90%, based on on-site sound measurements (from 52 dB down to 38 dB).
-
Stable heating, with rapid return to comfortable ambient temperatures.
-
Immediate remote control response, with no delay.
The client was informed of the proper maintenance habits to adopt, particularly for the filters and moisture drainage, in order to extend the life of the equipment. We also recommended an annual HVAC maintenance visit, especially for wall-mounted units installed in humid or poorly ventilated areas like bathrooms.
Why this type of service call is common in Bois-des-Filions
Many residential buildings in Bois-des-Filions are designed with narrow hallways and vertical room layouts, which leads to high-mounted wall installations, often difficult to maintain. This type of setup encourages:
-
Dust buildup in hard-to-reach areas.
-
Unabsorbed vibrations when mounting brackets are poorly installed.
-
Water drainage errors that damage internal components.
AirGreen’s expertise: tailored know-how
At AirGreen, we understand that every wall-mounted heat pump repair job requires not only advanced technical skills but also the ability to adapt to the installation environment. Our technicians are trained to work in complex architectural settings, with specialized tools for restricted access and strict safety protocols.
Maintenance tips for Manuflow wall-mounted heat pumps
To avoid future service calls on similar units, we recommend that residents of the North Shore, particularly in Bois-des-Filions, do the following:
-
Visually inspect the unit every 3 months.
-
Clean air filters every 6 weeks.
-
Schedule an annual HVAC maintenance appointment with AirGreen, ideally before the winter season.
A successful repair, comfort restored
This intervention in Bois-des-Filions perfectly illustrates our commitment to our clients: providing durable, customized, and professional HVAC solutions, regardless of technical or spatial constraints. Thanks to our expertise, this Manuflow wall-mounted heat pump regained full efficiency—bringing back comfort to the client’s home.
AirGreen, your trusted partner for all your residential HVAC repair needs in Montréal, Laval, Longueuil, the North Shore, and the South Shore.