An Elite wall-mounted heat pump that was no longer cooling properly: full diagnosis and intervention in Laval
At AirGreen, we regularly receive service calls regarding wall-mounted heat pumps that appear to be working normally but can no longer maintain a comfortable temperature inside the home. This is exactly the type of situation we recently encountered during a HVAC service call in Laval involving a Elite wall-mounted heat pump installed in an open area near a patio door.
Upon our arrival, the owner explained that the unit had been operating for several years without major issues. However, for the past few weeks, the system was cooling much less effectively, especially during hot days. The machine seemed to start normally, the indicator lights were functional, and no error codes were displayed. Yet, indoor comfort had clearly decreased.
The intervention quickly revealed several factors contributing to this performance drop.
Visual analysis of the installation
The indoor unit was installed high on an exterior wall, in a relatively favorable location for air distribution.
During our initial inspection, several elements caught our attention:
- Dust accumulation on the filters.
- Presence of deposits on the evaporator.
- Reduced airflow compared to the manufacturer's specifications.
- Light traces of moisture around the condensate drain.
- Preventive maintenance absent for several years.
Even though the Elite heat pump appeared clean at first glance, the internal components revealed a different reality.
Symptoms reported by the customer
The owner notably observed:
- Slow cooling.
- Prolonged operation without reaching the requested temperature.
- Increase in electrical consumption.
- Air blown is less cold than before.
- Slightly louder noise during operation.
These symptoms are common in wall-mounted systems whose maintenance has been neglected for several seasons.
Checking operating parameters
Before any mechanical intervention, we took a series of measurements:
Inlet and outlet temperature
The readings showed a temperature difference lower than the performance normally expected for this type of system.
Refrigeration pressures
Our instruments revealed a slightly abnormal pressure on the low-pressure side.
Electrical current
The compressor's power consumption remained within acceptable limits, allowing us to rule out a major motor failure.
Electronic inspection
No anomaly was detected on the main control board.
All these observations indicated that it was not a catastrophic failure, but rather a performance issue resulting from a combination of factors accumulated over time.
In-depth diagnosis and system restoration
After removing the protective panels, we were able to carry out a more detailed inspection.
Evaporator clogging
The main problem came from the indoor evaporator.
Over the years, dust particles, cooking residues, and airborne contaminants had gradually settled on the fins of the heat exchanger.
This buildup caused:
- Reduced airflow.
- Reduced energy efficiency.
- Less effective cooling.
- Increased strain on the compressor.
Partially clogged condensate drain
Our team also noticed the beginning of a blockage in the drainage pipe.
This type of problem can cause:
- Occasional overflows.
- Unpleasant odors.
- Mold formation.
- Premature deterioration of some internal components.
Fan inspection
The indoor turbine also showed a significant buildup of contaminants.
Even when the filters are occasionally cleaned by the owner, the turbine often remains inaccessible without professional disassembly.
When it gets clogged:
- Airflow decreases.
- Noise increases.
- Overall performance drops.
Checking the tightness of the refrigeration circuit
We conducted a thorough inspection to check for possible microleaks.
Fortunately:
- No sign of refrigerant leak.
- No significant corrosion.
- Mechanical connections in good condition.
- Insulation of the pipes still functional.
This check confirmed that the refrigeration circuit remained healthy.
Complete professional cleaning
Our intervention included:
Filter cleaning
The filters were removed and deeply cleaned.
Evaporator cleaning
A specialized treatment was applied to remove deposits accumulated on the heat exchanger.
Turbine cleaning
The blower wheel was thoroughly cleaned to restore its original performance.
Condensate tray decontamination
The tray and drain were completely cleared to ensure proper drainage of condensation water.
Final verification
All operating parameters were rechecked after the work.
Results obtained after the intervention
Once cleaning was completed, performance was immediately improved.
Our readings showed:
- Significantly increased airflow.
- Optimized blowing temperature.
- Quieter operation.
- Shorter cooling cycles.
- Reduced energy consumption.
The customer quickly noticed a significant difference in indoor comfort.
Why this type of problem is common in Laval
In many homes in Laval, but also in Montreal, Longueuil, on the North Shore and the South Shore, wall-mounted heat pumps operate almost year-round.
They serve:
- For heating during the winter.
- For air conditioning during the summer.
- For dehumidification during humid periods.
This intensive use promotes the gradual accumulation of contaminants inside the unit.
Without regular maintenance, even a reliable heat pump like an Elite can lose a significant portion of its efficiency.
The most common errors observed by our technicians
During our service calls, we regularly observe:
Insufficient filter cleaning
Many owners wait several years before cleaning the filters.
Lack of professional maintenance
Surface maintenance does not reach critical components.
Ignoring early symptoms
When performance gradually decreases, many users get used to the problem and wait for a breakdown to occur.
Prolonged operation with reduced flow
This situation increases the overall wear of the system and can eventually lead to much more costly repairs.
The importance of preventive HVAC maintenance
At AirGreen, we strongly recommend periodic preventive maintenance to:
- Maintain energy performance.
- Reduce electricity costs.
- Preserve indoor air quality.
- Avoid unexpected breakdowns.
- Maximize the lifespan of the heat pump.
For a typical residence in Laval, Montreal, Longueuil, the North Shore, or the South Shore, regular professional maintenance remains the most cost-effective investment to protect an HVAC system.
An AirGreen service that restored the full comfort of the home
This service on an Elite wall-mounted heat pump in Laval shows that a loss of performance is not always caused by a major failure. Thanks to a methodical diagnosis, a thorough inspection, and professional deep cleaning, we were able to restore the system’s performance without replacing major parts.
The customer now benefits from:
- Better comfort.
- More efficient cooling.
- Quieter operation.
- Reduced energy consumption.
- Peace of mind restored.
At AirGreen, every service call is handled with the same technical rigor to provide lasting solutions to owners of wall-mounted heat pumps, wall air conditioners, and residential HVAC systems throughout the greater Montreal area.