A precise service call to restore the comfort of a family home
At AirGreen , we were recently called to Sainte-Julie, on the South Shore of Montreal, to work on a Trane wall-mounted air conditioner installed in the main hallway of a single-family home. The customer contacted us after noticing that their unit was no longer producing cold air, despite an indicator light indicating normal operation. This situation, which is common at the beginning of the summer season, required a thorough diagnosis to avoid prolonged system failure.
Diagnosis: A sensor problem and neglected maintenance
Upon our arrival, our technician performed a complete inspection of the wall-mounted indoor unit . The Trane Clean Cool model , typical of many residential installations, had a visible layer of dust on the top panel and on the indoor condenser fins.
After removing the hood, we observed:
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A buildup of dust and pollen on the air filter and evaporator.
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A dirty interior temperature sensor , causing erroneous readings.
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An electronic card reacting intermittently , possibly due to humidity accumulated over the seasons.
Using our digital measuring instruments, we confirmed that the main board was correctly receiving the control signal, but the thermistor sensor was sending inconsistent values, preventing the outdoor compressor from starting.
Steps of repair
The Trane wall-mounted air conditioner repair was carried out in three methodical steps:
1. Complete cleaning of the interior module
We removed the filters and performed a thorough dry steam cleaning . This technique, which is gentle on electronic surfaces, removes greasy residue and dust without damaging the components. The evaporator fins were also gently brushed to restore optimal airflow.
2. Replacing the temperature sensor
We replaced the faulty thermistor sensor with an original Trane part, ensuring perfect compatibility. This sensor plays a vital role in temperature regulation: it allows the unit to detect ambient heat and modulate compressor power.
3. Checking overall operation
Once the part was replaced, we restarted the system in air conditioning mode and checked the R-410A refrigerant pressure outside. The measurements were correct, indicating a healthy refrigeration circuit. After 10 minutes of operation, the unit was diffusing air at 11°C , proof of restored performance.
Restored comfort and preventive recommendations
The customer immediately noticed the difference: the airflow was more powerful, the room temperature dropped quickly and no abnormal noise was noticeable.
We took advantage of this intervention to remind you of some good maintenance practices :
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Clean the filters at least once a month during the hot season.
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Have the system checked by a professional before each summer to avoid starting failures.
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Avoid blocking wall vents with furniture or curtains to ensure good circulation.
Simple neglect of maintenance can lead to compressor overheating or unnecessarily high energy consumption.
AirGreen expertise serving Sainte-Julie and the South Shore
This repair is a good example of our commitment to providing fast, thorough, and long-lasting service to every customer, whether it's a Trane, Fujitsu, Sharp, Gree, or Midea wall-mounted air conditioner.
Thanks to our team of certified technicians, we operate throughout the South Shore , including Sainte-Julie, Boucherville, Brossard, Saint-Lambert and Candiac , for any repair, installation or maintenance of residential and commercial HVAC equipment .
We know that the performance of an air conditioning system depends not only on the brand, but also on the quality of follow-up and maintenance . At AirGreen, every service call is an opportunity to give our customers back the comfort, reliability, and peace of mind they deserve.
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