An intervention under a terrace: expertise and precision signed AirGreen
At AirGreen , we encounter all sorts of unusual situations during our HVAC repairs. This time, our team traveled to Saint-Bruno-de-Montarville , on Montreal's South Shore , for a service call regarding a Frigidaire wall-mounted heat pump installed under a backyard deck.
The customer contacted us after noticing that their system was no longer blowing cold air and was emitting a disturbing metallic vibrating noise .
Context and initial observations on site
The installation, although originally well executed, had an unfavorable location : the outdoor condenser was attached directly to the wall, under a wooden deck structure. This configuration limited air circulation around the unit, creating a risk of compressor overheating and humidity buildup in the summer.
From the first minutes of the diagnosis, our technician noticed:
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A cyclical clicking noise , indicating a possible fan obstruction.
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Plant debris (leaves, dust, small branches) lodged between the fins of the condenser.
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A discharge temperature higher than normal (approximately 69°C).
The system operated on R-410A refrigerant, a high-performance gas but sensitive to pressure variations due to a lack of ventilation.
Detailed diagnosis: between overheating and mechanical imbalance
1. Check the fan
The outdoor fan was rotating, but unsteadily : the motor shaft had slight lateral play , caused by premature wear of the front bearing. This vibration was amplified by the resonance of the wooden floor above the unit .
2. Electrical and compressor inspection
No major anomalies were found on the control board. However, the compressor was cycling abnormally, indicating that the high pressure was reaching the safety threshold .
The cause? Poor heat evacuation due to the confined space under the terrace.
3. Checking the refrigeration circuit
Operating pressures indicated slight overheating and insufficient airflow around the condenser. After a thorough cleaning, we noticed an immediate improvement in airflow .
Repair and optimization of the installation
Step 1: Disassembly and complete cleaning of the condenser
The Frigidaire unit was disassembled and thoroughly cleaned . The fins were cleared of any obstructions, and an antibacterial and anti-corrosion treatment was applied to extend the life of the coil.
Step 2: Replacing the Fan Motor
The fan motor was replaced with a genuine Frigidaire part, calibrated to the manufacturer's specifications. This replacement eliminated vibration and stabilized rotation.
Step 3: Reorganize the unit's position
To optimize ventilation, we moved the condenser slightly forward, increasing the free space behind and above the unit. This doubled the airflow and reduced compressor operating temperatures.
Step 4: Performance Testing
After restarting:
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Operating pressure : returned to normal.
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Blown air temperature : 10.5°C in air conditioning mode.
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Stable and quiet cycle .
Results: Restored comfort and improved efficiency
Thanks to this intervention, the client found stable and uniform freshness in his home.
Measurements taken after optimization showed:
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A 25% reduction in compressor cycle time .
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A 3 dB reduction in exterior noise level .
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Better overall energy efficiency .
We also advised the customer to leave at least 1 meter of clearance around the unit and to regularly clean debris from under the deck to prevent future obstructions.
Our Frigidaire expertise on the South Shore
Frigidaire systems are renowned for their robustness, but like all wall-mounted heat pumps, their performance depends greatly on the installation environment .
At AirGreen , we frequently intervene to correct similar situations in Brossard, Saint-Bruno, Sainte-Julie, Boucherville and Longueuil .
Our services include:
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Repair and replacement of motors, cards, compressors .
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Professional cleaning and disinfection of units .
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Optimization of the installation to improve energy efficiency.
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Annual preventive inspection to detect problems before they occur.
Maintenance tips for under-deck installations
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Check the cleanliness of the condenser regularly (at least twice per season).
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Ensure adequate air circulation : 30 cm clearance on each side and 1 meter above.
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Install a heat deflector if the deck retains heat.
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Avoid storing bags of soil, wood or materials near the unit.
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Schedule an annual AirGreen professional interview before each summer.
AirGreen: your HVAC partner in Saint-Bruno and throughout Greater Montreal
At AirGreen , every repair is carried out with care, expertise, and transparency . We are committed to providing lasting, tailored solutions for every customer, whether it's a simple adjustment or a complex breakdown.
Our technicians serve Montreal, Laval, Longueuil, the North Shore and the South Shore daily, for all your HVAC repair, maintenance and installation needs.
AirGreen – Frigidaire air conditioning and wall-mounted heat pump experts at your service throughout Quebec.