When Neglected Maintenance Causes Complete Breakdown
At AirGreen , we often receive urgent calls during the first warm days of spring. This is precisely what happened to this customer in Sainte-Julie , on the South Shore of Montreal , whose Fujitsu wall-mounted air conditioner had suddenly stopped working. The problem seemed simple at first: the unit was no longer blowing cold air. However, behind this symptom lurked a much more complex problem.
Diagnosis: Extreme coil fouling and a corroded electrical panel
Upon arrival, our technicians immediately noticed that the customer had already removed the front cover of the indoor unit , thinking it was simply a filter cleaning. However, after a thorough inspection, we quickly identified the real cause:
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Evaporator coil completely clogged with dust and grease, limiting heat exchange.
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Excessive condensation caused a slight short circuit on the electronic control board.
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Electrical terminal block showing signs of corrosion due to moisture infiltration.
The system was therefore unable to start the outdoor compressor, thus blocking any production of cold.
Intervention: dismantling, deep cleaning and electrical repair
To restore the performance of the Fujitsu air conditioner, our team proceeded in stages:
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Power off and secure the circuit.
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Complete disassembly of the front panel, blower and condensate tray.
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Cleaning the coil with steam and biocide to remove dust, mold and sticky deposits.
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Repair of the corroded terminal block : replacement of the electrical connectors and repair of the weakened welds.
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PCB Test : We detected a damaged resistor and replaced it with a genuine Fujitsu part.
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Checking the R-410A gas pressure , which proved stable, confirming the integrity of the refrigeration circuit.
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Complete reassembly of the unit with cleaning of the filters and diffusion flaps.
Result: powerful cold air again and restored efficiency
Upon restarting, the Fujitsu wall-mounted air conditioner resumed normal operation. The air supply reached 9°C at the outlet , proving that the initial performance had been restored. The customer immediately noticed the difference: not only did the temperature drop quickly, but the noise level had also been reduced, thanks to the cleaning of the internal turbine.
We took the opportunity to remind him of the importance of professional annual maintenance , especially before summer, to avoid compressor overheating or control board failure.
What this service call teaches us
This type of breakdown is typical of poorly maintained wall-mounted air conditioners :
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Clogged filters and dirty coils force the appliance to work harder, increasing power consumption.
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Stagnant moisture promotes corrosion of electrical terminals , which often ends up blowing a fuse or burning out a circuit board.
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A simple preventative inspection by an AirGreen technician would have avoided this more costly repair.
At AirGreen, we offer tailored maintenance programs for homes on the South Shore, Laval, Montreal and the North Shore , including complete cleaning, gas testing, and temperature probe calibration.
An AirGreen commitment: performance, sustainability and peace of mind
Every intervention, like the one carried out in Sainte-Julie , reflects our approach: combining technical expertise , diagnostic rigor and attention to detail . We work with all the major brands — Fujitsu, Gree, Midea, Sharp, Hitachi, Goodman, Lennox — and we always have original spare parts to ensure the reliability of our repairs.
By restoring the performance of this Fujitsu wall-mounted air conditioner, we gave our customer back the coolness and comfort they expected, while extending the life of their HVAC system.
AirGreen — Your expert in wall-mounted air conditioner repair in Sainte-Julie, on the South Shore, in Laval and throughout Greater Montreal.