A quick service call for restored comfort
A customer in the Town of Mount Royal contacted us after noticing that their Sharp wall-mounted air conditioner was no longer producing cold air, despite a light indicating normal operation. During this hot summer, the situation was becoming urgent, especially since the unit was located in a south-facing room, constantly exposed to the sun.
At AirGreen , we know that a seemingly functional wall-mounted air conditioner can hide subtle internal anomalies: refrigerant leaks, a faulty control board, or simply a lack of maintenance. So we dispatched one of our certified technicians for a complete on-site diagnosis.
Initial diagnosis: lack of maintenance and a faulty sensor
The model in question belonged to Sharp's ZU1 series , a system known for its reliability and energy efficiency. However, like any HVAC unit, it requires regular maintenance to maintain optimal performance.
Our technician quickly identified the causes of the problem after a methodical inspection:
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Air filters saturated with dust , which severely limited air circulation;
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Blocked blower vanes , preventing the correct direction of cold air flow;
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Faulty interior temperature sensor , causing premature compressor shutdown;
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Accumulated condensate , suggesting a partially blocked drain.
These combined elements drastically reduced system performance, while risking long-term damage to the control board.
Steps of the AirGreen intervention
1. Cleaning and refurbishing filters
We removed the dirty filters and performed a thorough cleaning with an antibacterial solution . This simple action immediately improves air quality and energy performance.
2. Verification and calibration of sensors
The ambient temperature sensor was tested using a precision digital thermometer. The original probe displayed reading deviations of more than 4°C. We replaced it with a genuine Sharp replacement sensor , which now ensures accurate and stable temperature control.
3. Cleaning the condensate tray and drain
A gentle cleaning of the condensate tray was carried out, followed by flushing the drainage pipe using an air pump. This process prevents the formation of mold and unwanted odors, which are common when the system remains unused for several months.
4. Inspection of the motorized shutter and testing of the electronic card
We then checked the louver swing motor and the electronic board. No major damage was detected, but the louver movement was recalibrated to ensure uniform airflow throughout the room.
5. Final performance tests
After the maintenance was completed, the Sharp air conditioner was restarted. Tests revealed:
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A stable cold air flow at 8°C at the unit outlet;
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Power consumption in accordance with the manufacturer's specifications;
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Quiet operation, without unwanted vibrations or rattling.
The customer immediately noticed a marked improvement in thermal comfort in the room, with the room temperature dropping to 22°C in less than 15 minutes.
AirGreen Tips to Extend the Life of a Sharp Wall-Mounted Air Conditioner
Our experts recommend a few simple but essential actions:
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Clean the filters every two months during the warm season;
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Avoid obstructing ventilation grilles with furniture or curtains;
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Schedule a complete annual maintenance before summer;
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Watch for signs of moisture or unusual noise, indicators of impending trouble.
Regular maintenance not only ensures healthier air, but also reduces energy consumption by up to 20% .
Result: comfort restored and system protected
Thanks to a quick and targeted intervention , the customer's Sharp heat pump has regained its full efficiency. The compressor is operating at full capacity, the temperature is regulated precisely and the noise pollution has disappeared.
This repair perfectly illustrates the AirGreen approach: rigorous diagnosis, comprehensive maintenance, and lasting reliability . Whether it's for a Sharp, Fujitsu, Midea, or Gree air conditioner, our technicians cover all of Greater Montreal, Laval, the North Shore, and the South Shore with the same professionalism.