Repair of a Daikin wall-mounted air conditioner in Côte-des-Neiges

A Daikin wall unit that no longer cools

At AirGreen , we are regularly called upon to work in buildings and duplexes in the Côte-des-Neiges neighborhood of Montreal, where many residents use wall-mounted air conditioners of various brands, including Daikin. Like any wall-mounted air conditioner, these units need careful maintenance over time and sometimes a targeted repair to keep their performance.

This is exactly what happened during this recent maintenance and repair service : a customer contacted us after noticing that their wall-mounted unit was no longer producing cold air, despite having a running outdoor compressor.

The problem: no cooling despite the system being operational

Upon arrival, we performed a complete inspection of the system. The wall-mounted unit had a noticeable accumulation of dust on the evaporator , limiting heat exchange and partially blocking airflow. At the same time, the fan motor appeared to be running at low speed, a typical sign of a weakened starting capacitor .

The main findings:

• The indoor fan was not running at full speed.

• The air outlet temperature remained close to ambient temperature (24–25°C).

• The condensate drain was partially blocked.

• No major error codes appeared on the display, ruling out a serious electronic failure.

AirGreen intervention: a targeted refurbishment

1. Deep cleaning of the wall unit

We started by disassembling the hood and removing the washable filters. After a thorough cleaning of the turbine and evaporator with steam , we used a biodegradable disinfectant to remove microbial deposits responsible for odors and airflow restriction.

2. Replacing the starting capacitor

Our electrical tests confirmed that the capacitor had a 40% capacity loss. This component was replaced with a new, compatible capacitor, ensuring smooth restart of the blower motor and full airflow restoration.

3. Clearing the drain line

The condensate drain line, clogged with dust and mold deposits, was cleared using an air compressor and a specialized disinfectant. This step eliminated the risk of overflow and leaks on the interior wall—a common problem in older buildings in Côte-des-Neiges.

4. Checking communication with the outdoor unit

A quick inspection of the outdoor condenser confirmed that the compressor was functioning properly and the refrigeration cycle was intact. The R-410A refrigerant pressure remained stable, indicating a system that was still perfectly sealed.

Result: restored performance and immediate comfort

After these interventions, the supply air temperature dropped to 13°C , with a constant and quiet airflow. The customer immediately noticed the difference: the system once again provided constant and uniform freshness in his living room.

We took advantage of this visit to recommend to the owner a complete annual maintenance including:

• Professional cleaning of the outdoor condenser;

• A check of refrigerant pressures and charge;

• An inspection of the insulation of the pipes and the condensate pump;

• Preventive replacement of the start capacitor every 5 to 7 years to extend the life of the fan.

AirGreen know-how in Montreal

Our team makes it a point of honor to bring back to life Daikin, Fujitsu, Gree, Midea systems and other common brands on the Quebec market. This Daikin wall-mounted air conditioner repair in Côte-des-Neiges illustrates our approach: an accurate diagnosis , a rapid intervention , and a constant concern for the durability of the installation .

Whether in Montreal , Laval , Longueuil , or on the North Shore and the South Shore , our qualified technicians work on most brands and models, for a service that is both professional and human.

In conclusion: extend the life of a Daikin air conditioner with AirGreen maintenance

This case demonstrates that a well-maintained wall-mounted unit can still provide many years of service. At AirGreen , we believe that every repair is an opportunity to preserve the longevity of an existing HVAC system while ensuring the immediate comfort of our customers.

AirGreen — Specialists in HVAC system repair, maintenance and replacement in Montreal, Laval, Longueuil, North Shore and South Shore.