A difficult-to-access device requiring meticulous intervention
During this service call in Saint-Bruno , our AirGreen team was asked to resolve a problem with a Sharp wall-mounted air conditioner installed high above a narrow staircase. The customer had been reporting abnormal noise and a loss of blowing power for several weeks. The unit, belonging to the Sharp ZU1 series , provided the main air conditioning for the ground floor and mezzanine.
Working in such an environment—a staircase with narrow steps and no landing—requires not only great caution, but also careful planning of each step of the operation.
Complete diagnosis: locate the source of the noise and lack of air
Upon arrival, we carried out a complete visual inspection of the wall unit.
Several clues quickly guided our diagnosis:
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Dust accumulation on the filter and exchanger.
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Air direction flaps slightly blocked , causing poor flow.
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Abnormal vibrations when starting the fan.
We then measured the blowing temperature and observed a deviation of almost 7°C from the target temperature, indicating insufficient heat exchange . Further inspection revealed an unbalanced ventilation turbine , partially obstructed by dirt and pollen deposits.
Repair and in-depth maintenance
The limited space required the use of an articulated ladder with stabilizers , specially designed for stairs. Once safety was ensured, we undertook the following steps:
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Disassembly of the front cover and extraction of the air filter.
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Complete cleaning of the exchanger using a biodegradable product approved by Sharp.
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Disassembly of the turbine for high-pressure cleaning outside.
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Lubricate the blower motor and check the shaft alignment.
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Replacement of the blown air temperature sensor , the resistance of which was varying abnormally.
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Restart and electronic recalibration of the control board.
Once the repair was carried out, the device returned to smooth and quiet operation, with an air flow rate measured at 580 m³/h , in line with the manufacturer's specifications.
AirGreen Expertise: Safety and Precision in Complex Environments
This type of intervention demonstrates the value of our experience in HVAC repair in confined or atypical spaces .
Every movement and handling is calculated to avoid any damage to walls or stairs , while ensuring a complete and secure service.
Our technicians are trained according to RBQ and CCQ standards , and have specialized equipment to work at height, whether in a stairwell, a Montreal duplex or a multi-level house.
Result: comfort restored and efficiency regained
After the final tests, the results were clear:
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Air outlet temperature : 17.3°C for a set point of 23°C.
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Noise level : reduced from 52 dB to 39 dB.
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Airflow restored and power consumption normalized .
The customer immediately noticed a difference in air circulation and overall room comfort. The Sharp air conditioner was back to full performance, ready to take on the summer heat.
AirGreen: your reference in maintenance and repair of wall-mounted air conditioners
This intervention in Saint-Bruno , on the South Shore of Montreal , perfectly illustrates our approach: technical rigor, respect for the premises and precision of the diagnosis .
At AirGreen, we always prioritize lasting repair over hasty replacement, and we ensure that every device is tested, calibrated, and optimized before we leave.
Whether you are in Montreal, Laval, the North Shore or the South Shore , our teams are ready to intervene quickly for any Sharp, Fujitsu, Gree, Midea or Lennox wall-mounted air conditioner repair .