An urgent service call for an aging wall system
At AirGreen , we were recently contacted by a customer living in Sainte-Julie , on the South Shore of Montreal , whose Trane wall-mounted air conditioner was showing signs of weakness after several years of service. The unit, installed in the main living room, was no longer producing cold air, was making an unusual noise , and sometimes refused to start despite the customer's attempts via the remote control.
The unit in question, a Trane model from the 2000s , had already served well—but our team was determined to extend its useful life through a targeted and thorough repair .
Diagnosis: tired capacitor and unstable control board
Our certified technician began with a complete inspection :
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Airflow check : The interior fan was running intermittently.
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Compressor test : it tried to start but stopped after 2-3 seconds.
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Capacitor check : The starting capacitor was at the end of its life , showing a microfarad value well below that specified by the manufacturer.
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Control board inspection : Some electronic relays showed oxidation due to humidity.
These observations confirmed a combined failure of the capacitor and the control board, resulting in erratic starts and a general loss of performance.
Intervention: targeted system refurbishment
The intervention took place in several meticulous stages:
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Replacement of the start capacitor with an original Trane compatible part, to ensure stable starting current to the compressor.
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Complete cleaning of the evaporator coil , clogged with dust accumulated over the years.
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Electronic repair of the control board , with replacement of the main relay and resoldering of certain damaged tracks.
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Check the wiring between the indoor unit and the outdoor condenser , to ensure signal integrity and continuity.
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Complete system test after restart, including measurement of blowing temperature, pressure and power consumption.
Results: performance restored and comfort restored
Upon restart, the Trane wall-mounted air conditioner resumed smooth and stable operation.
The measured results:
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Blown air temperature : 12°C (excellent performance for a model of this generation).
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Noise reduction : the fan now rotated without vibration.
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Stable starting cycle , without cut-off or disconnection.
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Normalized power consumption , confirming that the compressor was operating at full efficiency.
The customer immediately felt the difference: fast and quiet cooling , ideal for warmer spring days.
AirGreen Expertise: Reviving Old HVAC Systems
Many customers contact us for devices installed more than 10 or 15 years ago.
At AirGreen , we believe that before considering a replacement, it is often worthwhile to carry out a thorough diagnosis . In the case of this Trane wall unit in Sainte-Julie , the repair cost less than a quarter of the price of a complete replacement , while extending the life of the unit by several years.
Our technicians are trained to:
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Quickly identify electronic faults on old motherboards (Trane, Lennox, Fujitsu, Gree, Sharp, etc.).
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Replace defective capacitors, sensors and relays with certified parts.
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Optimize performance without altering original components.
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Offer a clean, discreet and guaranteed service , adapted to the residential realities of the South Shore.
Prevention: how to avoid this type of breakdown
Capacitor and circuit board failures are common in aging systems. Here are some practical tips to prevent these problems:
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Have the system cleaned annually to reduce excessive heat on electronic components.
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Avoid electrical surges by using a protected outlet or stabilizer.
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Watch for unusual noises or startup delays , often the first signs of a weakened capacitor.
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Schedule preventative maintenance each spring before the warm season.
A successful intervention in Sainte-Julie
This repair of a Trane wall-mounted air conditioner in Sainte-Julie demonstrates that technical expertise and attention to detail can restore full performance to an aging unit.
Thanks to the intervention of our AirGreen team , the customer now benefits from a reliable, quiet system ready for several additional seasons.
AirGreen — Specialist in residential air conditioning and heating in Montreal, Laval, Longueuil, on the North Shore and the South Shore.