Home » Some of Our Service Calls in Greater Montreal » Repair of a Gree wall-mounted air conditioner in Sainte-Julie
Réparation d’un climatiseur mural Gree à Sainte-Julie
Reading time: 4'

Repair of a Gree wall-mounted air conditioner in Sainte-Julie

When an old wall system refuses to start: a classic case of electrical failure

At AirGreen , we regularly encounter wall-mounted air conditioners that suddenly stop working, often due to an internal electrical fault. This was the case for a residential customer in Sainte-Julie , on the South Shore of Montreal , whose Gree wall-mounted air conditioner stopped responding, even after several restart attempts.

The call was scheduled for early this week, and our technician quickly got on the road to diagnose and repair this fault that was threatening the comfort of the entire house.

Diagnosis: a Gree device at the end of its rope

Upon our arrival, we carried out a complete inspection of the Gree wall unit , a Comfort series model, installed over ten years ago. The symptoms were clear:

  • No indicator lights were illuminated on the front panel.

  • The wall thermostat was no longer sending a signal to the unit.

  • A subtle smell of overheating was coming from inside the case.

Before drawing any conclusions, our team checked the power supply. The circuit breaker was intact, as was the wall wiring. However, a continuity test on the wiring connecting the thermostat to the wall unit revealed a break in the control line .

Repair steps: safety, precision and complete restoration

To restore proper functioning, we followed a rigorous procedure:

  1. Complete power cut to secure the intervention area.

  2. Opening the top panel of the wall unit to access the main electronic board.

  3. Visual inspection : presence of a burn mark on a connector.

  4. Replaced the damaged connector and rewired it using insulated terminals and heat shrink tubing.

  5. Checked the internal transformer , then tested the fan control relay - both worked perfectly.

  6. Reinstall the cover , then complete start test .

Once the power was restored, the indicator lights came on. The unit started normally, blowing cool, steady air.

Result: a Gree air conditioner that comes back to life

After the repair, we measured the performance of the device:

  • Outlet air temperature: 10°C in cooling mode.

  • R-410A refrigerant pressures: within standards.

  • Sound level: stable and quiet.

We also cleaned the air filter, dusted the coil fins, and checked the condensate drain. These small touches extend the unit's lifespan and reduce the risk of future breakdowns.

The customer, relieved to regain his comfort, particularly appreciated our detailed explanations and our advice to prevent recurring electrical problems .

Common causes of electrical failure in wall-mounted air conditioners

A power failure on a Gree wall-mounted air conditioner (or any other model) can be caused by several factors:

  • Aging of electronic components (capacitors, relays, transformers).

  • Voltage fluctuations in the residential electrical network.

  • Loose or oxidized wiring in the wall or inside the unit.

  • Moisture infiltration into circuits, especially in houses where ventilation is insufficient.

At AirGreen, we always recommend performing annual preventative maintenance to identify these risks before they cause a complete breakdown.

Why Sainte-Julie Chooses AirGreen for Its HVAC Repairs

On the South Shore of Montreal , and particularly in Sainte-Julie , residences equipped with Gree, Fujitsu or Midea wall systems benefit from our recognized expertise .
Our customers appreciate:

  • Our speed of intervention , even in hot weather.

  • Our transparent and precise diagnostics .

  • Our repairs comply with manufacturer standards .

  • Our certified technicians take the time to explain each step.

We work on all major brands: Gree, Sharp, Fujitsu, Midea, Goodman, Bosch, Lennox, Trane , and many others.

AirGreen Tips: Protecting Your Air Conditioner Against Power Surges

Here are some simple recommendations to avoid similar breakdowns:

  • Install a voltage regulator or surge protector dedicated to the unit.

  • Never connect the air conditioner to a power strip.

  • Have wall wiring checked during renovations.

  • Turn off the power in winter if the unit will not be used for several months.

These simple precautions can save costly repairs and extend the life of your appliance.

AirGreen: a complete HVAC service in Montreal, Laval and the South Shore

At AirGreen , every repair is carried out with the same rigor: thorough diagnosis, total transparency, and attention to detail. Our goal is simple— to restore your comfort as quickly as possible , while offering you practical advice to maintain optimal performance.

Whether you are in Montreal , Laval , Sainte-Julie , or elsewhere on the North Shore and the South Shore , you can count on our team for reliable, efficient and lasting repairs.