Daikin wall-mounted air conditioner repair in Sainte-Julie

An AirGreen service that restores your comfort

When a Daikin wall-mounted air conditioner stops working at full capacity, indoor comfort is quickly compromised. At AirGreen , we understand how essential a cool, stable environment is, especially on hot summer days in Sainte-Julie . This service call perfectly illustrates our approach: methodical, fast, and sustainable intervention .

The context of the call

Our client, the owner of a modern condo in a quiet residential neighborhood of Sainte-Julie, contacted us after noticing that his wall-mounted Daikin was no longer producing cold air, even though the unit appeared to be working. No error code appeared on the screen, but the room temperature remained high despite being set to 20°C.

Initial inspection and initial findings

Upon arrival, we conducted a complete system analysis . The indoor unit, located in a narrow hallway, looked neat, but the ventilation was poor. Our technician first checked the following:

• The airflow at the unit outlet , to assess the fan performance.

• Operation of the outdoor compressor , using a voltage test.

• The discharge temperature , measured with an infrared thermometer.

Initial readings confirmed that the compressor was not starting properly, although the wall unit was responding to commands.

Diagnosis: A faulty relay in the control board

A thorough analysis revealed a fault on the electronic control board : the compressor relay was no longer transmitting the electrical signal needed to start it. This failure prevented the cooling cycle from starting, while leading the customer to believe that the system was operating normally.

We have proceeded to:

1. Complete verification of electrical connections and wiring between indoor and outdoor units.

2. Replacement of the defective relay with an appropriate replacement part.

3. Cleaning the filter and coils to ensure optimal air circulation after repair.

Full system recovery

After powering up, the compressor activated immediately. A new temperature reading showed an air outlet at 9.6°C , indicating a return to full efficiency. The customer noticed the difference within minutes: the corridor and surrounding rooms cooled quickly and evenly.

Technical know-how from AirGreen

Our qualified technicians work on most brands, including Daikin, and can quickly diagnose any type of fault:

• Electronic problems (control boards, relays, sensors).

• R-32 or R-410A refrigerant leaks .

• Fan or expansion valve malfunctions .

• Ice buildup on the evaporator or blockage of the condensate drain.

Each repair is followed by a complete check of the refrigeration cycle , to ensure that the system regains its original performance.

Our experts' advice to avoid recurring breakdowns

1. Clean your wall-mounted air conditioner filters every 4 to 6 weeks during the summer season.

2. Have the electronic board inspected every two years, especially after a power outage or surge.

3. Monitor the temperature difference between the supply air and the ambient air — it should be around 10°C for optimal operation.

4. Schedule an annual AirGreen service , which includes a complete cleaning and calibration of the system.

The AirGreen promise in Sainte-Julie and throughout Quebec

At AirGreen, we do more than just repair. We restore our customers' trust by offering transparent, fast, and sustainable service, backed by quality replacement parts and a warranty on every job.

Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our team is at your service for any request for repair, maintenance or HVAC installation .

This Daikin wall-mounted air conditioner repair in Sainte-Julie once again illustrates our commitment: to combine technical excellence and impeccable customer service , so that every home finds the comfort it deserves.