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.