An urgent service call in the West Island
At AirGreen , we often receive calls about wall-mounted air conditioners that have been installed for several years and whose performance has diminished over time. Recently, a resident of Sainte-Anne-de-Bellevue , in Montreal's West Island, contacted us about a Hitachi wall-mounted air conditioner that was no longer adequately cooling his living room. The unit, installed over ten years ago, was making noise when starting up and was producing almost no cool air.
Initial diagnosis: an aging but repairable device
Upon our arrival, our certified technician performed a complete system diagnostic . The first observation: a buildup of dust and dirt on the evaporator and fins. This phenomenon is common with older units, especially when they have not been cleaned annually. In addition, the outdoor unit was showing signs of wear on the compressor , a crucial element for the proper functioning of the refrigeration circuit.
After checking the power supply and the PCB signals , we found that the indoor fan motor was running intermittently — a common fault on older Hitachi models.
Steps of repair
To bring this wall-mounted air conditioner back to life, our team carried out the following steps:
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Thorough cleaning of the indoor unit coil using a specialized biodegradable cleaner.
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Checking the condensate and cleaning the drain pipe to prevent water leaks.
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Replacement of the interior fan motor , a part we had in stock in our service truck.
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Inspection of the refrigeration circuit for potential leaks, followed by a pressure test and topping up with R-410A refrigerant .
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Reset the electronic system and complete test of the cooling and ventilation cycles.
After these interventions, the air conditioner resumed optimal operation, once again providing efficient and quiet cooling .
The special features of Hitachi wall-mounted air conditioners
Hitachi wall-mounted systems are renowned for their durability, but like any HVAC unit, they require regular maintenance . Their frequency control technology offers attractive energy efficiency, but the sensitivity of the electronic boards can become problematic after several years of use, especially in dusty or humid environments.
We took advantage of this visit to explain to the client the importance of:
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annual preventive cleaning ;
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a refrigerant gas pressure check every two years;
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and periodic replacement of washable filters to maintain compressor performance.
Result: restored comfort and energy savings
After the repair, the customer immediately noticed a noticeable difference in room temperature and a reduction in operating noise . Thanks to the motor replacement and complete circuit cleaning, the air conditioner's power consumption decreased by approximately 15%.
At AirGreen , we always favor repair before replacement , when it is technically and economically advantageous. In this case, a simple refurbishment avoided the cost of a new unit while extending the life of the system by several years.
Recommended maintenance for wall-mounted air conditioners in Montreal and Laval
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , regular maintenance of your wall-mounted air conditioner is essential for:
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prevent refrigerant leaks ;
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avoid compressor overheating ;
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reduce energy consumption;
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extend the life of your device.
Our technicians respond quickly to any noise, leak or performance issues on Hitachi, Fujitsu, Midea, Gree, Zephyr, Sharp, Bosch, Goodman , and many other brands.
Conclusion
This Hitachi wall-mounted air conditioner repair in Sainte-Anne-de-Bellevue perfectly illustrates the AirGreen approach: fast, precise, and sustainability -focused service. By combining our technical expertise with a preventative approach, we help our customers enjoy optimal comfort, summer and winter, while avoiding premature replacements.
Need HVAC maintenance or repair?
At AirGreen, we operate throughout Greater Montreal to diagnose, repair and maintain your wall-mounted systems and multi-zone heat pumps.