A Sharp system put to the test during the Quebec winter
When you live on the South Shore of Montreal , a wall-mounted heat pump is an essential ally for getting through the coldest weather while enjoying efficient and economical heating. In Sainte-Julie , a customer recently contacted us about a breakdown of their Sharp Eco Inverter heat pump , a model renowned for its performance and Plasmacluster Ion technology, but which, after several winters, required special attention.
The customer noticed that the heating was no longer working properly , that the outdoor unit was accumulating ice and that the compressor seemed to struggle to start in negative temperatures.
On-site diagnosis: understanding the cause of the problem
Upon arrival, we noticed that the Sharp outdoor unit , installed on a raised aluminum platform , was partially blocked by ice . This type of situation is common when the automatic defrost system is no longer working optimally.
Our certified technicians undertook a complete inspection of the refrigeration circuit and the electrical system :
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Checking the automatic defrost mode via the electronic card;
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Testing the outdoor temperature sensor (thermistor) ;
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Control of operating pressures of R410A refrigerant ;
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Inspection of fans and compressor ;
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Observation of air flow and defrost cycle .
The verdict: the defrost sensor was defective, preventing the heat pump from entering defrost mode, thus causing ice to build up on the outdoor heat exchanger and blocking airflow .
Technical intervention: complete system restoration
We have carried out a complete overhaul of the Sharp outdoor module :
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Complete defrosting of the unit using warm water and a hot air blower (no metal tools to avoid damaging the fins);
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Replacement of the defrost sensor with an original Sharp part;
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Cleaning the outdoor coil to restore optimal heat transfer;
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Checking the control board and updating the defrost program;
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Refrigerant recharge after pressure and subcooling measurement;
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Complete test of the heating/defrost cycle to validate the correct operation of the system.
The whole thing took less than two hours, under demanding winter conditions. Once the intervention was completed, the heat pump was working perfectly again, with a powerful and stable flow of hot air .
Result: comfort restored and prevention for the months to come
Thanks to this repair, the customer regained constant indoor comfort , even during nights at -15°C. Energy consumption also decreased significantly, a sign that the heat pump was once again operating at its nominal efficiency.
We took the opportunity to recommend some good winter practices to the client:
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Regularly check that the outdoor unit is free of snow and ice;
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Never turn off the heat pump during very cold weather to avoid difficult restarts;
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Schedule annual preventative maintenance before winter to check sensors, pressures and electronic cards.
AirGreen expertise in Sainte-Julie
At AirGreen , we pride ourselves on offering highly specialized HVAC repair and maintenance services for all brands, including Sharp, Fujitsu, Midea, Gree, Zephyr, Lennox, Trane and many more.
Each intervention is carried out according to a rigorous protocol guaranteeing:
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A quick and accurate diagnosis ;
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The use of original manufacturer parts ;
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A sustainable return to service ;
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And above all, total customer satisfaction .
Our mission: to restore our customers' comfort while optimizing the performance and longevity of their HVAC equipment.
In conclusion
This service call in Sainte-Julie demonstrates the importance of regular maintenance, especially for systems installed in snowy environments. Thanks to a quick and targeted intervention, AirGreen brought a Sharp Eco Inverter heat pump back to life, ready to face the rigors of Quebec's winter—efficiently, quietly, and reliably.
AirGreen – Your trusted HVAC partner in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
We provide repair, maintenance and installation of all brands of wall-mounted and central heat pumps.