A sudden breakdown in the middle of spring: AirGreen expertise at work
At AirGreen , we know that an efficient HVAC system is essential for the comfort of Montreal homes, especially as the seasons approach. It was in this context that we were called to intervene in Rosemont–La Petite-Patrie , for a Gree wall-mounted heat pump installed on the balcony of a typical duplex in the neighborhood. The unit, although relatively new, refused to start despite the signals from the remote control.
Symptoms reported: A silent compressor and a recurring error code
The customer explained that for the past two days, the heat pump had stopped responding to commands. The indoor unit was flashing and displaying an “E6” error code , indicating a loss of communication between the indoor and outdoor units . This type of problem, common on certain Gree models, requires accurate diagnosis to avoid unnecessary replacements.
Step 1: Complete System Inspection and Diagnosis
Upon our arrival, our technician began by checking the communication wiring between the two units.
Initial observations revealed:
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Slightly damaged insulation on the cable connecting the condenser to the wall head.
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Traces of moisture on the connection terminals, probably due to spring condensation.
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A blown fuse in the condenser electronic module.
These elements confirmed that the cause of the problem came from a minor electrical fault , but sufficient to block the start of the compressor.
Step 2: Repair and Recommissioning
Once the diagnosis was established, we carried out a series of meticulous interventions:
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Replacing the fuse on the outdoor condenser control board.
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Thorough cleaning and drying of the connection terminals .
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Checking electrical continuity using a professional multimeter.
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Sealing exposed cables with heat shrink tubing to prevent future water infiltration.
We then reset the unit and ran a full heating and cooling cycle to verify the system was working properly.
Step 3: Performance control and calibration
After restarting, both units resumed communication without error.
Our measurements confirmed:
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Stable voltage at 240 V on the compressor.
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Indoor/outdoor temperature difference of 10°C , a sign of excellent efficiency.
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No persistent error codes at the end of the tests.
The system has returned to full performance, ready to face the temperature fluctuations of Montreal's spring.
Gree reliability, reinforced by AirGreen know-how
Gree wall-mounted heat pumps are renowned for their durability and energy efficiency. However, like all electronic equipment, they remain susceptible to voltage fluctuations, humidity, and weakened connections. With our extensive expertise in HVAC circuits , we can quickly distinguish between minor and major faults, saving our customers time and money.
Preventive maintenance tips to extend lifespan
To avoid similar failures, we recommend all our customers to:
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Have electrical connections inspected once a year , especially for installations exposed to the weather.
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Clean the internal filters every 3 to 4 weeks during heavy use seasons.
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Keep the outdoor unit clear of any obstacles within 30 cm.
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Schedule a complete maintenance in the spring , before the temperatures rise.
These simple actions ensure optimal operation , reduced energy consumption , and better interior comfort .
Fast and professional service in Rosemont and throughout Montreal
The Rosemont customer was able to enjoy restored comfort and a quiet, stable device the next day.
At AirGreen , every service call is handled with the same rigor: accurate diagnosis, clear explanations, and lasting repairs. Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we do everything we can to provide impeccable HVAC repair service.