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Réparation d’une thermopompe murale Air Crystal à Chomedey (Laval) : retour au confort en une seule visite
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Air Crystal wall-mounted heat pump repair in Chomedey (Laval): restored comfort in just one visit

When a wall-mounted heat pump starts "running unnecessarily," blowing lukewarm air, or shutting down unexpectedly, you immediately feel it in your home: discomfort, rising humidity, poorer sleep… and the fear of skyrocketing energy bills. This week, we responded to a call in Chomedey (Laval) for a complete repair of an Air Crystal wall-mounted heat pump whose outdoor unit was showing clear signs of performance loss.

On site, the installation is typically residential: an outdoor unit mounted on supports, a refrigerant line protected by a discreet vertical cover , and easy access to the service area near the entrance. An ideal setting for a precise diagnosis and a clean, hassle-free recommissioning.

The reported problem: unstable heating and declining performance

The customer contacted us because of the heat pump:

  • heated properly at first, then became irregular ;

  • took longer to reach the set point;

  • seemed to work for a long time without proportional results;

  • and, at times, gave the impression of "disconnecting" (abnormal cycles).

This type of symptom, on a wall-mounted heat pump, can stem from several causes: refrigerant , electrical/communication issues , sensors , or even heat exchange (dirt, obstruction, insufficient ventilation). At AirGreen, the goal is always the same: no guesswork . We measure, we confirm, then we repair.

Step 1 — Visual checks and inspection of the installation

Before even plugging in the instruments, we do a complete walkthrough:

  • condition of the condenser (fins, impact, corrosion);

  • clearance around the unit (air circulation);

  • stability and level of the supports;

  • condition of the line cover and crossings (friction indices, vibration);

  • inspection of connections accessible at the service panel.

In this particular case, the Air Crystal outdoor unit was correctly positioned, with a properly installed line cover. There were no major obstructions in front of the grille, which quickly ruled out some of the causes related to air asphyxiation. However, certain details (microscopic traces and operating behavior) pointed us toward a very common cause: a problem in the refrigeration circuit , typically a small leak at a connection.

Step 2 — Technical diagnosis: isolate the true cause

We then proceeded with a sequence of standardized measures, which helps to avoid "random repairs":

1) Electrical control and communication

  • checking the power supply and connections in the compartment;

  • visual inspection of wiring and tightening;

  • checking start-up parameters (compressor/fan behavior).

Result: stable power supply, no obvious electrical anomalies.

2) Refrigeration measurements and behavior under load

We analyzed the consistency between:

  • Expected pressures/values ​​(depending on external conditions),

  • inverter compressor behavior

  • stability of the blown temperature inside.

The diagnosis: insufficient performance and signs consistent with a suboptimal refrigerant charge , often caused by a micro-leak . This is the kind of situation where the machine is running… but “below its potential,” which puts strain on the system and increases consumption.

Step 3 — Locating and confirming the point of concern

Rather than simply "adding more gas" (which is bad practice if the leak is not addressed), we followed the rigorous method:

  • thorough inspection of flare fittings and sensitive points;

  • validation of pressure behavior over the course of minutes;

  • confirmation of the problematic area before intervention.

In residential wall-mounted installations, the most common cause is a slightly loose connection , an imperfect flare, or a micro-leak that appears after thermal cycling (expansion/contraction). These are details, but it is precisely these details that make the difference between a reliable heat pump… and a temperamental one.

Step 4 — Repair: correction, sealing, clean return to service

Once the cause was confirmed, we carried out the repair according to best practices:

A) Intervention on the connection / section concerned

  • restoring the problematic area;

  • tightening correction with a professional approach (neither too much nor too little);

  • safety measures to limit the risks of vibration and mechanical stress.

B) Vacuum sealing and leak testing

After any work on the circuit, we don't "start" blindly. We carry out:

  • vacuuming to dry and stabilize the circuit;

  • stability check to rule out any residual leakage;

  • Final validation before recharging.

C) Load adjustment and functional testing

  • recharge/adjustment according to the actual needs of the system;

  • heating test (and stability checks);

  • Parameter validation: temperatures, intensity, cycle regularity.

Result: restored comfort, stabilized cycles, reassured customer

After being put back into service, the Air Crystal wall-mounted heat pump has returned to normal operation:

  • more stable cycles;

  • faster temperature rise;

  • immediate and consistent feeling of comfort;

  • smoother operation (less unnecessary effort).

That's exactly what we're looking for: not only "it's starting up again", but it's starting up correctly , with measurements that confirm that the system is working under good conditions.

Key takeaway: why a small leak becomes a big problem

A micro-leak in a wall-mounted heat pump isn't just a performance issue. Over time, it can cause:

  • decreased efficiency (more time to heat/cool);

  • Compressor overuse;

  • irregular cycles;

  • risk of accelerated wear;

  • higher operating costs.

The right approach: intervene early , make a proper diagnosis, and correct at the source.

Our AirGreen tips to prevent it from happening again

To maximize the lifespan of a wall-mounted heat pump (Air Crystal or other):

  1. Don't ignore the "subtle" signs (lukewarm, unstable, strange cycles).

  2. Have the unit checked if it has been subjected to vibrations, shock, or if the installation is a few years old.

  3. Ensure the outdoor unit can breathe: no obstruction, sufficient clearance.

  4. Opt for light maintenance: cleaning, inspection, and checks before the coldest weather.

Conclusion: a clean, measured, and sustainable repair in Laval

In Chomedey (Laval) , this intervention perfectly illustrates our approach at AirGreen: methodical diagnosis , clean repair, verification of results, and only resumption of work when performance is truly satisfactory. A properly adjusted and airtight Air Crystal wall-mounted heat pump provides reliable comfort… and peace of mind all season long.