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Réparation d’une thermopompe murale Comfortmaker à Rosemont–La Petite-Patrie
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Repair of a Comfortmaker wall-mounted heat pump in Rosemont–La Petite-Patrie

Sudden loss of performance in the heart of a Montreal duplex

In Rosemont–La Petite-Patrie , our AirGreen technicians were recently called for an urgent repair of a Comfortmaker wall-mounted heat pump installed on the rear facade of a typical Montreal duplex. The customer, concerned about a sudden loss of performance, noticed that his heat pump was blowing warm air instead of cold air, despite the audible operation of the outdoor compressor.

The intervention highlighted a common problem on wall-mounted systems: a partial accumulation of ice in the evaporator , combined with a lack of refrigerant .

Initial observation and detailed diagnosis

Upon our arrival, we carried out a complete diagnosis of the system:

  • Inspection of the Comfortmaker condenser , mounted high on a galvanized wall bracket.

  • Analysis of the airflow around the outdoor unit, to ensure that no obstacles hinder ventilation.

  • Control of operating pressures using our electronic pressure gauges.

  • Communication test between indoor unit and compressor.

The results were clear:

  • Abnormally low suction pressure .

  • Presence of frost at the service connection .

  • Discharge temperature slightly higher than standard.

These signs indicated a lack of R-410A refrigerant due to a microleak on a crimp in the copper line .

Steps of repair

The intervention took place in several rigorous phases:

  1. Recovery of the refrigerant remaining in the circuit, in accordance with current environmental standards.

  2. Leak detection using pressurized nitrogen , confirming minimal seepage at a brazed connection.

  3. Cleaning and re-welding with an oxyacetylene torch , with a silver rod to ensure a lasting seal.

  4. Extended 45 minute leak test at 350 psi to ensure pressure stability.

  5. Deep vacuum (500 microns) using a professional pump.

  6. Complete R-410A recharge , calibrated according to Comfortmaker specifications.

Once the system was restarted, the pressures stabilized and the interior blowing temperature dropped back to 11°C , demonstrating perfect performance.

Performance control and final cleaning

We took advantage of this intervention to carry out a complete maintenance of the external condenser :

  • Steam cleaning the coil.

  • Degreasing the protective grid.

  • Checking the wall support and drainage slope.

  • Tightened the electrical box and replaced a slightly cracked grommet.

On the interior side, a cleaning of the filters and an antibacterial treatment of the fan completed the service.

Result: comfort restored and system made more reliable

At the end of the intervention, the Comfortmaker wall-mounted heat pump was once again operating at full efficiency. The customer immediately noticed a rapid cooling of his home , as well as a noticeable reduction in operating noise thanks to the airflow balancing.

We also recommended the implementation of annual maintenance , in order to prevent any risk of leaks or future clogging.

AirGreen Best Practices for Wall System Sustainability

Every AirGreen intervention is part of a preventative approach. Our certified technicians place particular emphasis on:

  • Checking the tightening torque of the refrigeration connections.

  • Keep the coils clean to prevent the compressor from overheating.

  • Maintaining adequate clearance around the condenser to ensure good air circulation.

  • The exclusive use of parts and refrigerants that comply with Canadian and environmental standards.

AirGreen expertise in Montreal and on the North and South Shores

Whether you are in Montreal , Laval , Longueuil , Brossard , Terrebonne or Sainte-Thérèse , AirGreen is your trusted partner for any Comfortmaker wall-mounted heat pump repair service.

We work on:

  • Compressor or electronic card failures.

  • Pressure problems, leaks or abnormal noise .

  • Preventive maintenance and complete cleaning of units.

  • Energy efficiency optimization and seasonal calibration.

Conclusion

This Comfortmaker wall-mounted heat pump repair in Rosemont–La Petite-Patrie perfectly illustrates our commitment to extending the life of existing systems through precise technical know-how and interventions compliant with RBQ and CCQ standards . At AirGreen, each service call is handled with rigor, transparency and efficiency , to guarantee the lasting comfort of our customers.