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Réparation d’une thermopompe murale Sanyo à Fabreville (Laval) : performance retrouvée, confort rétabli
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Sanyo wall-mounted heat pump repair in Fabreville (Laval): performance restored, comfort restored

In Fabreville, Laval, we serviced a Sanyo wall-mounted heat pump (a mini-split) installed on a wall bracket, along an exterior vinyl siding. This type of installation is very common in residential settings: compact outdoor unit, disconnect box nearby, insulated refrigerant lines connected directly to the compressor.

The client contacted us about a problem that seemed simple, but which often ends up quickly degrading comfort: less efficient air conditioning, longer cycles, and irregular performance on hot days.

Symptoms observed on site: when the machine "struggles" without delivering the expected result

Upon our arrival, the scenario was typical of a wall unit that functions, but not to its full potential :

  • Cooling is present, but slow and inconsistent.

  • It seems like the system is running longer than before.

  • Slight noise/vibration noticeable near the outdoor unit

  • Signs of wear on the outdoor installation: exposed connections, aging insulation on the lines, wall mounting which should be checked

On a Sanyo inverter , these signals are important: inverter technology modulates power continuously, so when something goes wrong (pressure, heat exchange, ventilation, electrical control), the machine compensates… until it no longer compensates.

Our AirGreen diagnostic: checking the air, the cooling and the electricity (in the correct order)

For a reliable repair, you never "recharge" randomly and you never replace parts blindly. We followed our standard three-part method.

1) Mechanical control and installation

The unit is mounted on a wall bracket (very useful for preventing snow accumulation and protecting the unit), but this can also amplify vibrations if:

  • The anchors have worked over time.

  • the support is no longer perfectly stable.

  • The conduits/cables are pulling on the machine.

So we checked:

  • tightening the fasteners,

  • the alignment of the unit,

  • the condition of the silent blocks / contact points,

  • the routing of conduits and ducts.

2) Refrigeration control (pressures, stability, leak tightness)

Next, let's get to the heart of the problem: the refrigeration circuit.
We measured operating pressures , stability under load, and paid particular attention to fittings (often flanges ) and areas where insulation is fatigued.

Result: the values ​​indicated "possible" but not optimal operation, which is very compatible with a slight loss of refrigerant over time or a penalized heat exchange (fouled coil, disturbed ventilation, etc.).

3) Electrical control and protections

The photo clearly shows the disconnect box next to the unit. This is a key point: a poor connection, a worn contact, or an incorrectly calibrated protection can cause erratic behavior.

We have checked:

  • the wiring and tightening,

  • the general state of the protections,

  • the quality of the connections (no overheating, no oxidation),

  • the operation of the outdoor fan and the response of the inverter.

The repair: correcting the cause, not just the symptom

After validating the diagnosis, we carried out a complete, clean and lasting intervention:

  1. Inspection and repair of connections susceptible to micro-leaks (critical areas, flanges, tightening to the appropriate torque).

  2. Leak testing and circuit conditioning to confirm stability.

  3. Proper vacuuming to remove moisture and contaminants — essential to protect the compressor and ensure good performance.

  4. Adjusting the charge by refrigerating in a controlled manner (according to readings, not "by feel").

  5. Cleaning/checking the outdoor coil and checking the ventilation (a dirty exchanger can dramatically reduce efficiency).

  6. Vibration reduction : adjustments to the wall bracket, slight repositioning of the conduits/duct to avoid any mechanical stress, and checking the level of the unit.

Result: stabilized performance, shorter cycles, immediate comfort

Once the Sanyo heat pump is back in operation and stabilized:

  • The system has regained a rapid performance increase

  • The cycles have become shorter and more consistent again.

  • The machine no longer "struggles" unnecessarily: the desired comfort is achieved without excessive consumption.

  • Noise/vibration near the outdoor unit has been significantly reduced , which also improves the perceived quality on a daily basis.

In short: comfort restored, efficiency regained, and customer reassured .

The takeaway: a Sanyo inverter can last a long time… if it is properly maintained and repaired.

Sanyo wall-mounted heat pumps often have excellent longevity, but in Quebec (temperature variations, heating/cooling cycles, humidity, freezing/thawing), small details make a big difference: fittings, cleanliness of the exchangers, stability of the support, quality of electrical connections .

At AirGreen, our approach is simple:

  • to diagnose methodically,

  • correct the cause,

  • to restore the system to stable and efficient operation.

Need a Sanyo wall-mounted heat pump repair in Laval or Greater Montreal?

If your wall-mounted heat pump is cooling less, heating unevenly, making more noise, or seems to be running continuously, our team can intervene quickly with a clear diagnosis and a lasting repair.