When a lack of maintenance causes a complete shutdown
At AirGreen , we often receive emergency calls in the spring, when the first HVAC system restarts reveal problems that remained hidden during the winter. This was the case for this Gree wall-mounted heat pump , installed in a single-family residence in Sainte-Julie , on Montreal's South Shore . The customer contacted us after noticing that the unit was no longer blowing hot or cold air—a classic sign of an airflow blockage or a faulty circuit board .
First observation: a blocked interior unit
Upon arrival, we first visually inspected the indoor unit. It was a Gree Lomo+ model—a popular series known for its energy efficiency and quiet operation. However, one detail stood out: the blower blades remained closed, even in fan mode. Additionally, a flashing light indicated an error code related to a communication problem between the indoor and outdoor boards.
Our technicians immediately understood that the problem probably came from a poor contact on the PCB or a buildup of dust that had disturbed the temperature sensor.
In-depth diagnosis by our HVAC experts
Before any intervention, we carried out the following checks:
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Supply voltage : stable at 240 V — no external electrical anomalies.
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Error code : Decrypted via the Gree manual, indicating an E6 error (interrupted communication between units).
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Drain inspection : presence of stagnant condensation under the drain pan — sign of neglected maintenance .
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Discharge temperature : lower than normal, confirming a lack of heat exchange.
Using our measuring instruments, we confirmed that the control signal was no longer reaching the indoor fan board.
Repair and recommissioning of the Gree wall-mounted heat pump
Our technicians carried out a complete intervention in four stages :
1. Complete cleaning of the interior module
We disassembled the front panel, removed the filters, and performed a gentle steam cleaning of the evaporator coil. This cleaning not only improves air quality, but also prevents the electronics board from overheating.
2. Checking and resoldering the PCB connector
A slightly oxidized connector on the main board was cleaned and resoldered. This small detail was the cause of the complete failure of the internal fan.
3. Checking the thermistor sensor
We replaced a faulty indoor temperature sensor , which was causing false readings that prevented the unit from starting its heating cycle.
4. Full performance test
Once the device was reassembled, we launched a complete test cycle :
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Smooth start-up without error flashing.
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Stable hot blowing at 46°C at the outlet .
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Sound level measured at only 29 dB , in line with Gree specifications.
Result: comfort and efficiency restored
After our intervention, the Gree heat pump regained its full heating and cooling capacity . The customer, who initially considered a complete replacement, was able to see that the repair was sufficient to extend the life of the unit by several years. We also recommended annual preventive maintenance , which is essential to prevent the reappearance of moisture or corrosion on the electronic boards.
AirGreen's advice for your Gree wall-mounted heat pump
To keep your Gree system running efficiently and quietly, here are some simple but crucial recommendations:
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Clean filters every 2 to 3 months, especially during peak seasons.
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Check for free air circulation around the indoor and outdoor unit.
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Have electronic boards and temperature sensors inspected at least once a year.
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Avoid turning off the power supply during the winter: this prevents the self-defrost cycles from working properly.
Why choose AirGreen for your HVAC repairs in Sainte-Julie and elsewhere?
At AirGreen, we combine technical expertise with human service . Every service call is handled with rigor:
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Precise and detailed diagnosis.
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Genuine parts for all brands (Gree, Sharp, Fujitsu, Midea, Mitsubishi Electric, Zephyr, etc.).
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Rapid interventions in Montreal, Laval, Longueuil, on the North Shore and the South Shore .
Our mission is clear: to restore your thermal comfort efficiently, while extending the lifespan of your HVAC equipment.
Conclusion: proof of Gree reliability and AirGreen expertise
This Gree wall-mounted heat pump repair in Sainte-Julie perfectly illustrates the power of preventative maintenance and technical expertise. In just a few hours, our experts brought a previously immobilized unit back to life, guaranteeing our customer optimal comfort and restored peace of mind .
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