Repair of a Senville Wall-Mounted Heat Pump in Saint-Constant

A Senville Aura wall heat pump that was cooling less effectively and starting to leak inside

In Saint-Constant, our AirGreen team was called for a Senville wall heat pump repair, specifically an indoor unit from the Senville Aura series, installed high in a residential room. The client had noticed two symptoms that were occurring more frequently: a drop in cooling performance and visible water accumulation near the air outlet. The system was still working, the remote control responded normally, but the air blown was no longer as cold as before and the unit seemed to have difficulty evacuating its condensate.

This type of service call is common with wall heat pumps used intensively during the summer on the South Shore, especially in houses, condos, and apartments where the indoor unit runs for several hours a day. A wall heat pump like the Senville Aura may seem simple at first glance: a wall unit, a motorized flap, filters, an indoor coil, a turbine, and a drain. Yet, when a performance or water drainage problem arises, the diagnosis must be precise. A condensate leak can come from a clogged drain, a misaligned pan, a dirty coil, insufficient airflow, a slightly misaligned installation, or even the beginning of ice formation.

In this case in Saint-Constant, our goal was clear: identify the real cause, avoid unnecessary interventions on the refrigeration circuit, and restore the machine to reliable operating condition.

A Senville Aura wall unit installed near the ceiling

The image of the service shows a Senville Aura wall unit installed high on an interior wall, close to the ceiling. This position is typical for a wall heat pump, as it promotes effective air distribution in the room. The unit appeared clean externally, with no visible damage to the cover, and the front indicators seemed normal. However, the external appearance of a wall unit does not always reveal the true condition of its internal components.

In this type of system, several components can become clogged over time:

• the washable filters;
• the evaporator coil;
• the cylindrical turbine;
• the drainage pan;
• condensate line;
• diffusion flaps;
• temperature sensors;
• internal areas behind the front panel.

The client mainly used the device for air conditioning. When a wall-mounted heat pump cools the air, ambient humidity condenses on the indoor coil. This water must then flow to the drainage tray and be evacuated through the condensate pipe. If this path is partially blocked, water can accumulate inside the unit and eventually leak out the front or sides.

Symptoms observed before the intervention

The client explained that the problem began with a simple drop in comfort. The room took longer to cool, and the blown air seemed less powerful. Then, small traces of moisture appeared under the indoor unit. The issue was not constant at first but became more noticeable on hot and humid days.

The main symptoms were as follows:

• air less cold than usual;
• reduced airflow;
• slight damp smell at startup;
• occasional water drops under the unit;
• less effective diffusion flaps;
• longer cycles;
• no error code displayed;
• normal remote control operation.

These signs pointed us toward an issue related to airflow and condensate drainage, rather than a complete compressor or electronic board failure. A device that still works but cools less effectively and starts leaking requires a thorough internal inspection.

Initial diagnosis: filters, coil, and turbine

Our technician first safely opened the wall unit. The filters were dirty but not completely blocked. The problem was deeper: the coil had a buildup of fine dust, and the cylindrical turbine showed darker deposits inside the blades. This type of dirt reduces airflow and causes a drop in heat exchange.

In a Senville wall-mounted heat pump, the indoor fan must push air through the cold coil. If the filters, coil, or turbine are clogged, air circulation is reduced. The coil can then become too cold in spots, increasing the risk of excessive condensation or even ice formation. When this ice melts, water can overflow from the tray or flow into unintended areas.

We also checked the motorized flap and the diffusion path. The movement was functional, but the air projection was less uniform than expected, confirming the impact of internal dirt buildup.

Inspection of the condensate tray and drain

The second part of the diagnosis concerned water drainage. The drainage tray contained biological deposits and a buildup of dirt typical of wall systems that often operate in air conditioning mode. The drain was not completely clogged, but its flow was too slow. On a very humid day, this slowness was enough to cause intermittent overflow.

We checked:

• The condition of the condensate tray;
• Presence of deposits in the drain outlet;
• The drainage slope;
• Actual flow after adding water;
• Signs of moisture near the bottom of the unit;
• The cleanliness of internal areas;
• The absence of visible cracks in the tray.

The diagnosis confirmed a combined cause: reduced airflow due to internal clogging and slowed condensate drainage. This kind of situation often gives the impression of a more serious failure, but a well-executed technical intervention usually restores operation without replacing the unit.

Why it was important not to conclude too quickly that refrigerant was lacking

When a wall-mounted heat pump cools less effectively, some owners immediately think of a refrigerant leak. In some cases, this is indeed possible. But in this intervention in Saint-Constant, the symptoms did not primarily indicate a significant charge loss. The unit started, communication between units was normal, and the performance drop was more related to insufficient air circulation and a drainage problem.

Adding refrigerant without a complete diagnosis would have been a mistake. An incorrect charge can harm performance, increase operating pressure, and accelerate compressor wear. At AirGreen, we always check mechanical, maintenance, and installation causes before recommending any intervention on the refrigeration circuit.

Technical cleaning of the indoor unit

Once the diagnosis was confirmed, we proceeded with a technical cleaning of the indoor unit. The work had to be done precisely, as a wall-mounted heat pump contains electronic components, motors, sensors, and sensitive plastic parts.

The intervention included:

• Partial disassembly of the front panel;
• Removal and cleaning of filters;
• Cleaning of the evaporator coil;
• Cleaning of the indoor turbine;
• Disinfection of the condensate tray;
• Clearing the drain outlet;
• Controlled rinsing of the drainage pipe;
• Verification of the motorized flap;
• Visual inspection of sensors;
• Reassembly of components;
• Complete test in air conditioning mode.

Cleaning the turbine was particularly important. A dirty turbine can keep spinning but move much less air. The client hears the fan, sees the flap move, but actual performance decreases. After cleaning, the airflow became more regular and stronger.

Result: a more stable, cleaner wall-mounted heat pump without condensate overflow

After the intervention, we restarted the unit and completed a full air conditioning cycle. The blown air was more constant, airflow improved, and condensate drained normally. No drops reappeared under the unit during the test.

Operation validation after repair

Our technician let the unit run long enough to observe the system’s reaction under real conditions. The goal was not only to check that the unit started but to confirm that performance had become consistent again and that water was draining properly.

We verified:

• the response to the remote control;
• starting in air conditioning mode;
• the stability of the airflow;
• the blowing temperature;
• the absence of overflow;
• the proper movement of the flap;
• the drain flow;
• the absence of persistent humidity odor;
• the quiet operation of the indoor unit.

The client quickly noticed the difference: the room cooled better, the airflow was more uniform, and the concern about water under the unit was resolved.

Advice given to the client to prevent the problem from recurring

A wall-mounted heat pump requires regular maintenance, especially when frequently used for air conditioning. In Saint-Constant, summer humidity can be high, and wall units produce a lot of condensate. A partially clogged drain can therefore become problematic quickly.

We recommended to the client to:

• clean the filters regularly during the warm season;
• do not wait for humidity odors to appear;
• monitor any water traces under the unit;
• avoid blocking air diffusion with tall furniture;
• schedule professional cleaning when airflow decreases;
• have the drain checked before periods of high humidity;
• do not disassemble internal parts without proper equipment.

These tips apply as much to Saint-Constant as to Montreal, Laval, Longueuil, on the North Shore and the South Shore, where wall systems are often used for several months.

Common mistakes with Senville Aura units

Senville Aura wall units are popular because they offer a compact solution to heat and cool a room. However, like all wall heat pumps, they become vulnerable when indoor maintenance is neglected.

The mistakes we often see during our service calls are:

• believing that clean filters are always enough;
• ignoring the indoor fan;
• waiting for a water leak to become significant;
• using the unit continuously without seasonal maintenance;
• closing the shutters manually;
• spraying inappropriate products inside the unit;
• assuming that a drop in cooling automatically means a refrigerant shortage;
• forgetting that the drain can get dirty even if the unit seems clean.

In this case, the client responded well by requesting a service call before water caused damage to the wall or floor. A quick intervention made it possible to fix the problem without major replacement.

A precise HVAC repair, without unnecessary parts

This intervention in Saint-Constant clearly illustrates our approach at AirGreen. A good HVAC repair is not about randomly changing parts. It starts with listening to symptoms, inspecting the installation, diagnosing internal components, then correcting the real cause.

In this case, no compressor, electronic board, or complete unit replacement was necessary. The problem came from a lack of deep maintenance and a slowed drain. The solution was therefore a technical cleaning, clearing of the condensate system, and a complete validation of the operation.

Restored comfort for a residence on the South Shore

At the end of the service call, the Senville Aura wall heat pump had regained more stable operation. The client could use the air conditioning without fear of water overflow and without experiencing a constant drop in performance. Indoor comfort was restored, and the unit could continue to serve effectively.

For AirGreen, this type of repair demonstrates the importance of a methodical service. A wall unit that simply seems dirty or less efficient may hide a drainage problem that could cause damage. By acting quickly and correctly, we protect both comfort, equipment, and the interior of the residence.