Repair of a Fujitsu Mini Split Heat Pump in Laval
Struggling with a broken heat pump? Discover how AirGreen expertly repaired a Fujitsu Mini Split in Laval, fixing refrigerant leaks and replacing the compressor for optimal performance.
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An Unexpected Twist: Restoring Comfort to a Home in Laval
When we received a call from a customer in Laval reporting issues with their Fujitsu Mini Split Heat Pump, we knew this repair would require a blend of technical expertise and creative problem-solving. This ductless system, renowned for its efficiency and compact design, had been a reliable source of year-round comfort—until it wasn’t. The unit had developed a frustrating issue: intermittent cooling performance coupled with unusual noises. Armed with our tools and know-how, we set out to bring this indispensable appliance back to life.
Understanding the Problem: The Initial Inspection
Our first step was a thorough diagnostic. Upon arriving at the residence, we immediately noticed that the outdoor unit seemed to be struggling, with unusual vibrations hinting at a possible mechanical fault. Inside, the air handler was operational but failing to maintain consistent airflow. The homeowner also mentioned a spike in their electricity bill, a classic indicator of an overworked heat pump.
We conducted a full inspection, including:
- Checking refrigerant levels.
- Examining the outdoor fan motor for wear.
- Inspecting the air handler for dirt or blockages.
- Running diagnostics on the control board.
The Culprit: A Faulty Compressor and Refrigerant Leak
Our investigation revealed two primary issues: a minor refrigerant leak and a compressor that was showing signs of wear and tear. The refrigerant leak had compromised the system's efficiency, forcing the compressor to work harder than necessary. Over time, this strain had caused it to overheat and partially fail.
This type of problem is common with older units or systems that haven’t been regularly maintained. However, Fujitsu systems are designed with durability in mind, so we were confident that with some expert care, this unit could be restored to peak performance.
The Repair Process: A Step-by-Step Solution
1. Addressing the Refrigerant Leak
We began by locating the source of the refrigerant leak, which was found in one of the copper lines leading to the outdoor unit. Using a high-precision electronic leak detector, we pinpointed the exact location and repaired the line with a brazing technique to ensure a durable seal. Afterward, we conducted a vacuum test to confirm that the system was airtight.
2. Replacing the Compressor
The compressor, often considered the heart of a heat pump, required replacement. Using genuine Fujitsu parts, we carefully removed the old compressor and installed a new, high-efficiency model. This process involved:
- Safely discharging any remaining refrigerant.
- Replacing the compressor with a compatible unit.
- Recharging the system with the correct amount of refrigerant.
3. Cleaning and Optimization
Before wrapping up, we cleaned the indoor and outdoor coils to improve heat exchange efficiency. We also replaced the air filters, ensuring optimal airflow. Finally, we recalibrated the system to ensure it met the manufacturer’s specifications.
Challenges and Unique Aspects of the Repair
What made this repair particularly interesting was the customer’s unique setup. The outdoor unit was mounted on a narrow balcony, limiting our workspace. Our team had to employ special compact tools to maneuver within the confined area safely. Additionally, Laval's chilly winter temperatures were just around the corner, making this repair urgent to ensure the homeowner’s heating needs would be met.
Why Regular Maintenance Matters
This repair underscored the importance of regular maintenance for mini split heat pumps. Small issues, like refrigerant leaks, can escalate over time, leading to costly repairs and reduced efficiency. At AirGreen, we recommend scheduling professional maintenance at least once a year to:
- Clean filters and coils.
- Inspect refrigerant levels.
- Check for wear and tear on mechanical components.
- Ensure optimal performance.
The Outcome: A Happy Customer and a Reliable Heat Pump
By the end of the day, the Fujitsu Mini Split Heat Pump was back in action, running smoothly and efficiently. The homeowner was thrilled not only with the repair but also with the professional and courteous service provided by our team. As they prepared for winter, they could rest easy knowing their heat pump was ready to tackle Laval’s temperature swings.
Why Choose AirGreen for Your HVAC Repairs?
At AirGreen, we pride ourselves on delivering exceptional HVAC repair services across Montreal, Laval, Longueuil, North Shore, and South Shore. Our team combines technical expertise with a customer-focused approach to ensure every job exceeds expectations. When you choose us, you benefit from:
- Certified technicians with extensive experience.
- Transparent pricing with no hidden fees.
- Fast response times for urgent repairs.
- Access to genuine parts for long-lasting solutions.
Whether you’re dealing with a malfunctioning heat pump or need routine maintenance, we’re here to help.
Contact Us Today
Experiencing issues with your mini split heat pump? Don’t wait for the problem to get worse. Contact AirGreen for professional and reliable service that you can trust.
How the job unfolds
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
The symptoms, since when, the model (on the unit's label) and the error code if there is one.
We look for the cause, not just the symptom: readings, components, installation.
Repair, part to order or replacement, depending on the failure. We explain what we found.
The repair is done and parts replaced as needed.
The unit is restarted and checked in its operating modes.
What caused the failure and what can keep it from coming back.
- Your callThe symptoms, since when, the model (on the unit's label) and the error code if there is one.
- On-site diagnosisWe look for the cause, not just the symptom: readings, components, installation.
- The optionsRepair, part to order or replacement, depending on the failure. We explain what we found.
- The workThe repair is done and parts replaced as needed.
- TestsThe unit is restarted and checked in its operating modes.
- AdviceWhat caused the failure and what can keep it from coming back.
What we check on a job like this one
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
The right pages, at the right time
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
What should I have ready before calling?
Repair or replace?
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).