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Réparation d’un climatiseur mural Trane au Plateau-Mont-Royal
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Repair of a Trane wall-mounted air conditioner in Plateau-Mont-Royal

A breakdown in the middle of the summer heat

At AirGreen , we were recently approached by a client in Plateau-Mont-Royal , Montreal, regarding a Trane wall-mounted air conditioner installed in a bright apartment with large windows. The client, working from home, was experiencing a noticeable loss of performance: the unit was no longer blowing cold air, and the outdoor compressor remained silent.

The system, an 18,000 BTU Trane , was installed more than ten years ago. This type of unit, known for its robustness, nevertheless requires regular inspection to maintain its efficiency.

Initial diagnosis: an internal electrical fault

Our AirGreen technician began the complete diagnosis by following a methodical procedure:

  • Check the electrical panel : stable supply voltage and functional circuit breakers.

  • Communication test between the indoor unit and the outdoor unit: no response from the external module.

  • Visual inspection of the outer casing : no signs of mechanical damage, but intermittent relay noise suggested a problem with the control board .

The analysis confirmed a faulty electronic board —a common problem on older Trane models exposed to large voltage fluctuations.

Technical intervention: replacement of the control board

The control board was replaced with a genuine Trane part compatible with the customer's series. The key steps of the intervention are as follows:

  1. Complete disconnection of the system and securing of the circuit.

  2. Removing the old board after discharging the capacitors.

  3. Installation and calibration of the new card, including reprogramming of the communication protocol between the units.

  4. Complete test of cooling and defrost cycles to verify synchronization.

After restarting, the Trane wall-mounted air conditioner immediately resumed normal operation: the compressor started, the cold air reached 9°C at the diffuser outlet , and indoor comfort was restored in less than 20 minutes.

Preventive maintenance and recommendations

Our AirGreen technicians don't just repair—every service includes a comprehensive inspection to ensure HVAC system reliability:

  • Cleaning of indoor and outdoor coils ;

  • Control of condensate drains ;

  • Checking refrigerant pressures and evaporating temperature;

  • Analysis of compressor power consumption .

We also advised the client to have annual preventive maintenance , which is essential for:

  • Maintain the energy performance of the system;

  • Prevent power surges that damage electronic boards;

  • Avoid sudden stops during heat waves.

AirGreen expertise serving Montreal comfort

The work on this Trane wall-mounted air conditioner in Plateau-Mont-Royal demonstrates our team's versatility: technical expertise, speed of execution, and attention to detail. At AirGreen, every call is handled with care, whether for a minor breakdown or a complete HVAC system overhaul.

We operate throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , and we make it a point of honor to offer a service:

  • Professional and transparent , no hidden costs;

  • Durable , thanks to certified parts and work that complies with RBQ and CCQ standards;

  • Adapted to the real needs of each residential or commercial customer.

Thanks to this approach, the Plateau-Mont-Royal customer now benefits from a comfortable indoor climate, a more reliable device and peace of mind signed AirGreen .