Fast and meticulous intervention on a Fujitsu wall-mounted heat pump
At AirGreen , we know that a reliable heating, ventilation, and air conditioning (HVAC) system is essential for our customers' comfort. This week, our team responded to a service call in the Côte-des-Neiges neighborhood of Montreal regarding a Fujitsu wall-mounted heat pump that was experiencing intermittent failure.
Context of the service call
The customer contacted us after noticing that his Fujitsu heat pump was intermittently not producing heat, especially on cooler mornings. According to his report, the outdoor fan sometimes seemed inactive while the indoor unit was operating normally. This is a classic symptom of a communication problem between the electronic boards or a malfunctioning compressor relay .
The outdoor unit, a Fujitsu wall-mounted condenser , was installed at a safe height, away from debris and snow—a best practice we consistently recommend to extend equipment life.
Detailed diagnosis
Upon our arrival, our technicians carried out the following checks:
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Visual and mechanical inspection : no signs of refrigerant leakage, no excessive frost or abnormal vibration.
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Electrical test : Stable voltage at the unit input (240V). However, an intermittent control signal between the indoor main board and the outdoor power board was detected.
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Electronic module analysis : after disassembling the case, we noticed slight oxidation on the control board connectors – probably caused by condensation accumulated during spring temperature variations.
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Compressor relay test : irregular operation confirmed during repeated cycles.
Intervention carried out
After validation with the client, we proceeded to a partial replacement of the electronic board and a complete cleaning of the connectors with a specialized anti-humidity product. The team also:
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checked the refrigeration circuit pressure (no loss detected, R-410A refrigerant compliant)
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tightened the electrical and mechanical connections
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cleaned the condenser fins and the condensate drain hole
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performed a full test in heating and cooling mode
Result and performance after repair
After restarting, the Fujitsu heat pump returned to full performance. The compressor engaged with every command, and the indoor blown air temperature reached 34°C in less than 5 minutes—an excellent indicator of efficiency.
The customer, relieved to see that the intervention had restored full operation, also appreciated our advice for preventive maintenance :
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Clean the internal filters every two months.
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Avoid obstructing air circulation around the outdoor condenser.
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Schedule an annual AirGreen inspection before the heating season.
Why this repair illustrates our AirGreen expertise
This intervention in Côte-des-Neiges is a perfect example of our rigorous and methodical approach to HVAC repair :
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We diagnose precisely before replacing anything.
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We prioritize sustainability over temporary solutions.
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We work with genuine Fujitsu parts to ensure compatibility and performance.
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Our certified technicians detect root causes —not just symptoms.
Mistakes to avoid according to our experience
Many homeowners, when faced with a wall-mounted heat pump failure, try quick solutions:
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unplug and replug without checking the supply voltage,
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add refrigerant unnecessarily ,
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or ignore an unusual compressor noise .
These actions can make the situation worse. The best practice remains to call a certified professional like AirGreen, who has advanced diagnostic tools and a thorough understanding of Fujitsu systems.
A service that reflects AirGreen's trust
Our Côte-des-Neiges client now benefits from a perfectly functional, quieter and more responsive system. As always, our goal is to provide fast, courteous and sustainable service , throughout Montreal , Laval , the North Shore and the South Shore .
In summary:
This Fujitsu wall-mounted heat pump repair demonstrates our expertise and commitment to maintaining the comfort of Quebec homes, even in the face of Montreal's climatic hazards.
At AirGreen, every service call is treated as a precision mission , combining technical expertise and attention to detail.