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Réparation d’une thermopompe murale Gree à Saint-Léonard
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Repair of a Gree wall-mounted heat pump in Saint-Léonard

Rapid intervention to restart a system essential to comfort

A homeowner in Saint-Léonard , in the east end of Montreal , recently contacted us about a broken Gree wall-mounted heat pump that was no longer blowing cold air even though the outdoor compressor seemed to be working. With the high summer temperatures, rapid intervention was required to restore comfort in the home.

At AirGreen , we know that the performance of a wall-mounted heat pump depends as much on its maintenance as on the quality of the installation. Our team therefore carried out a complete and methodical diagnosis of the unit.

Description of the system and context

The installation involved a Gree 12,000 BTU wall-mounted heat pump , from the Lomo series , used to cool and heat a single-family home. The outdoor compressor was installed on a wall bracket, near a back door, against a beige brick wall .
The owner noted a gradual loss of cooling power , followed by a complete shutdown of the interior fan .

Stages of technical diagnosis

Our technicians followed a precise protocol to identify the cause:

  1. Visual and audible inspection of the outdoor unit

    • No abnormal noise coming from the compressor.

    • The condenser fins were clean and unobstructed.

    • The initial static pressure appeared stable, which ruled out a major leak.

  2. Checking the indoor unit

    • The wall fan would not start despite an active cooling control.

    • The LED on the indoor unit was flashing repeatedly — a typical error code for a faulty control board .

  3. Electrical measurements

    • Correct voltage at the indoor unit input.

    • Intermittent communication signal between the main board and the fan motor.

    • Diagnosis confirmed: faulty electronic card (PCB board).

Repair and recommissioning

After discussion with the customer, we proceeded to a complete replacement of the electronic card of the wall module.

Here are the main steps of the intervention:

  • Secure removal of the wall cover to access internal components.

  • Dismantling of the defective electronic card and installation of the new original Gree card .

  • Checking electrical continuity and communication signals.

  • Complete system restart and test in cold mode then in heating mode.

The whole thing was done in less than 90 minutes.

Result: comfort and performance restored

Upon restart, the heat pump resumed a stable cycle with an air outlet temperature of 8°C , confirming a return to optimal performance.
The compressor ran quietly, and communication between the indoor and outdoor units stabilized.

The customer was able to immediately feel the return of thermal comfort and was impressed by the speed of the repair.

AirGreen Maintenance Recommendations

To prevent this type of electronic failure on Gree systems , our experts recommend:

  • Clean the internal filters regularly (every 4 to 6 weeks).

  • Protect electronic boards from power surges using a regulator or surge protector.

  • Schedule a complete annual maintenance , including cleaning the condenser and checking the electrical connections.

  • Maintain sufficient clearance around the outdoor unit (at least 30 cm on the sides and 60 cm at the front).

These simple actions can extend the life of the device by several years.

AirGreen expertise in Montreal and on both shores

This repair perfectly illustrates the AirGreen philosophy: speed, precision and transparency.
We work on all makes and models, whether Gree, Fujitsu, Sharp, Midea, Daikin, Trane, Bosch, Goodman or Zephyr .
Our certified technicians serve all of Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore .

Every service call is treated with the same rigor, whether it's an electronic part replacement, a refrigerant recharge, or preventative maintenance.

Summary of the intervention

  • Device type: Gree wall-mounted heat pump

  • Location: Saint-Léonard, Montreal

  • Problem: Interior fan inactive, no cold

  • Cause: Faulty control board

  • Solution: Replace the electronic card, fully test, restart

  • Result: Fully functional system and stabilized interior temperature

AirGreen: Your Trusted Partner for HVAC Repairs

At AirGreen , we believe that every intervention is an opportunity to build trust with our customers.
Our HVAC repair, installation and maintenance services cover all residential and commercial sectors of Greater Montreal , with a single objective: to guarantee your comfort all year round thanks to rigorous work and original parts.