Sudden power outage in a modern condo in Brossard
At AirGreen , we are regularly called to diagnose and repair wall-mounted heat pumps installed in recent condos in Brossard , on the South Shore of Montreal. It was precisely in this context that we were contacted by a customer whose Hisense device suddenly refused to start, in the midst of rising spring temperatures.
The client explained that the indoor unit seemed to be receiving power—the lights were on—but no air was circulating. In an open-concept space like this, this outage was depriving the entire apartment of air conditioning and supplemental heating. Our team planned a rapid response to restore comfort as quickly as possible.
On-site technical diagnosis
Upon arrival, we found a modern Hisense wall-mounted unit installed in the living room above a metal bookcase, perfectly representative of a typical condo layout. Here are the main steps of the diagnostic performed by our certified technician:
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Checking the power supply and dedicated circuit breaker
No voltage issues were noted. The unit was receiving its 240V power supply. -
Testing the communication signal between the indoor and outdoor unit
Using our multimeter, we detected an intermittent loss of signal between the circuit boards. This failure is common on certain series of Hisense wall-mounted heat pumps after a few years of use. -
Blower Motor Inspection
The internal turbine was blocked by a build-up of dust and dirt , preventing the fan from rotating fully. This caused an automatic safety shutdown upon startup. -
Main circuit board (PCB) control
We also noticed some slight oxidation on the motor connector, likely caused by condensation generated over time.
Repair steps performed
To restore this Hisense wall-mounted heat pump to perfect condition, our AirGreen technician undertook the following actions:
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Complete cleaning of the blower and interior evaporator using a professional biodegradable product, guaranteeing better air quality and optimal energy efficiency.
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Disassembly and anti-corrosion treatment of oxidized connectors.
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Resealing condensate drain insulation to prevent drips and future moisture.
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Communication test between units to ensure stable compressor response.
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Checking the heating mode and the cooling mode to confirm the performance of both thermal cycles.
After restarting, the heat pump resumed smooth, quiet, and efficient operation . The flow of cold air was once again circulated throughout the living room, restoring immediate comfort for the client.
Results and recommendations to the client
Once the repair was complete, we explained to the customer the importance of annual preventative maintenance . Wall-mounted heat pumps, although efficient and economical, require regular cleaning to avoid:
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Clogged filters and blower.
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Mold buildup in the condensate tray.
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The progressive corrosion of electronic connectors.
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Energy efficiency losses can reach 20 to 30%.
We also recommended adding an accessible wall-mounted circuit breaker and slightly raising the cabinet under the unit to facilitate future maintenance.
AirGreen expertise: fast and reliable service on the South Shore
Every day, our teams operate in Brossard , Longueuil , Saint-Lambert and elsewhere on the South Shore to repair all types of residential HVAC systems:
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Wall-mounted and central heat pumps
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Wall-mounted and Multi-Zone air conditioners
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Air exchangers and humidifiers
Our mission: to provide professional, courteous and long-lasting service , supported by accurate diagnostics and repairs that comply with manufacturer standards.
At AirGreen, we believe that every repair done well extends the life of your appliance and reduces your energy footprint .
An exemplary repair in Brossard
Thanks to a methodical approach and recognized expertise in the field of heating, ventilation and air conditioning , we were able to bring this Hisense wall-mounted heat pump back to life without having to resort to a complete replacement.
The customer, relieved to find immediate comfort, has also planned to register his device for our annual AirGreen maintenance program , guaranteeing constant performance and peace of mind throughout the year.
If your system is showing signs of weakness—difficulty starting, a damp smell, abnormal noise, or no cooling— contact AirGreen today , your trusted partner for HVAC repair in Montreal, Laval, Longueuil, the North Shore, and the South Shore .