When the heat hits, accurate diagnosis makes all the difference
At AirGreen , we often receive urgent calls when temperatures rise and wall-mounted air conditioning systems stop working. This was recently the case in Saint-Laurent , where a customer contacted us after noticing that their Fujitsu wall-mounted air conditioner was no longer cooling properly, was making an abnormal noise, and was displaying an intermittent error light.
Initial inspection and complete diagnosis
Upon our arrival, our certified technician performed a complete inspection of the Fujitsu system . The indoor unit, mounted high on a living room wall, showed several typical signs of poor maintenance:
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heavily clogged air filters,
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clogged exchanger fins,
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and slightly loose electrical panel, revealing the connection terminals.
We immediately checked the communication between the indoor unit and the outdoor compressor. A voltage test revealed poor continuity in the control wiring , likely due to a oxidized connection . This type of failure can cause intermittent fan or compressor shutdowns, resulting in uneven cooling.
Repair Steps
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Power cut to secure the intervention.
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Thorough cleaning of filters and coil using a biodegradable cleaner.
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Tightening of electrical connections and replacement of oxidized terminals.
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Condensate check : The drain had a slight blockage caused by dust and accumulated moisture.
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Post-intervention performance test : after powering up again, the heat pump resumed a stable cycle, with a blowing temperature of 8°C in cooling mode, perfectly in line with Fujitsu standards.
Results and customer satisfaction
The customer could immediately feel a noticeable difference in comfort : fresh air, quiet operation and reduced vibration. We took the time to explain good maintenance practices , including:
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clean the filters every two months;
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maintain a clear space around the unit;
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and plan for annual professional maintenance to avoid any major breakdowns.
AirGreen Expertise: The Difference of a Local Service in Saint-Laurent
Our technicians specializing in wall-mounted air conditioner repair in Montreal, Laval, and on the North and South Shores have the experience necessary to quickly diagnose the causes of a breakdown—whether it's an electrical problem, an R-410A refrigerant leak, or a simple lack of maintenance.
Each intervention is also an opportunity for us to check the energy efficiency of the system and ensure that the unit is operating according to the most recent efficiency standards.
When to call AirGreen
You notice that your air conditioner:
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no longer cools;
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makes an unusual noise or vibration;
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leaks or produces excessive condensation;
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displays a flashing error light;
So, it's time to call our team of HVAC specialists . At AirGreen, we guarantee fast, durable, and safe repairs , backed by genuine parts and local expertise recognized throughout the greater Montreal area.
In conclusion
This case in Saint-Laurent perfectly illustrates the importance of regular maintenance and professional diagnosis . Thanks to a methodical and rigorous intervention, our team was able to put back into service a Fujitsu wall-mounted air conditioner that seemed ready for replacement. Proof that, very often, repair is better than replacement when the fault is addressed in time.