A service call in an apartment converted into an office
At AirGreen , we work in both residential and small home offices. That day, our team went to Boisbriand , on Montreal's North Shore , for a service call regarding a Sharp wall-mounted heat pump installed in a home converted into a workspace. The customer reported an intermittent failure : the unit would start, blow warm air, then shut off after a few minutes, without automatically restarting.
The environment included several electronic devices, a computer, and even an old window air conditioner still in place, making the room's heat load particularly unstable.
Diagnosis: electronic card failure and dirty sensor
After a thorough inspection, our technicians quickly isolated two distinct issues:
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The main electronic board showed signs of wear and micro-oxidation on several connectors.
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The interior temperature sensor was dirty, causing the ambient temperature reading to be inaccurate.
This double malfunction explained the random shutdowns of the heat pump: the system received incorrect temperature information and cut off the compressor before reaching the setpoint.
Complete intervention: repair and recalibration
Our specialists have proceeded meticulously to restore the unit to perfect working order:
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Replacement of the original Sharp electronic board
The part has been replaced with a compatible board supplied directly by the authorized Sharp distributor, ensuring electronic stability and full compatibility with the wall unit. -
Cleaning the sensor and indoor coil
Using a biodegradable and non-corrosive product, we cleaned the sensor as well as the coil to ensure accurate thermal measurement and better air circulation . -
Full cycle recovery and testing
After resetting, the heat pump restarted without any errors. We took temperature and pressure readings over several cycles, confirming the system's stability. -
Checking the power line and connections
The electrical installation has been checked to prevent any problem of unstable voltage , a factor often overlooked but responsible for repeated breakdowns on this type of equipment.
Result: restored reliability and regained efficiency
Once the repairs were completed, the Sharp heat pump returned to quiet and consistent operation , with a cold blow at 8°C and perfect cycle stability . The customer immediately noticed improved thermal comfort and the elimination of temperature fluctuations that were hampering his work.
We concluded the visit with personalized recommendations :
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Have electrical connections checked every two years.
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Clean the filters every month during the summer.
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Avoid blocking air circulation with curtains or furniture.
AirGreen expertise at the service of your comfort
At AirGreen , every service call is an opportunity to demonstrate our rigor and experience in the HVAC field . We work on all brands of wall-mounted heat pumps , including Sharp, Fujitsu, Gree, Midea, Lennox, Zephyr, and Goodman , throughout Greater Montreal, Laval, Longueuil, the North Shore and the South Shore .
Our goal: to restore comfort, improve the durability of your systems, and ensure optimal performance all year round.