A night service call for an R-410A refrigerant leak
At AirGreen , we often respond to urgent situations related to performance losses in Fujitsu wall-mounted heat pumps , especially in early spring, when systems switch from heating to cooling mode. This is exactly the case during this intervention in Laval-des-Rapides , where a customer contacted us in the evening: his unit was no longer producing heat and the outdoor compressor seemed to be running continuously without any tangible results.
Diagnosis: a slow leak in the refrigeration circuit
Upon arrival, we immediately noticed that the Fujitsu wall-mounted heat pump , installed on a side wall of the residence, was displaying abnormally low pressure. Using our electronic manifold , we connected our high and low pressure hoses and found that the R-410A refrigerant had almost completely escaped from the circuit.
The signs observed:
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Warm indoor outlet air temperature despite heating mode being activated.
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Irregular compressor noise.
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Oil accumulation on a bend in the copper line, a typical sign of a microleak.
This slow loss, although minimal, was enough to drastically reduce the system's efficiency.
Steps of repair
1. Leak detection and repair
We injected a fluorescent tracer into the circuit, then used a UV lamp to pinpoint the leak. It was coming from a cracked solder joint on the suction line at the compressor outlet. After purging and isolating the circuit, we made a silver solder repair , then performed a leak test under nitrogen pressure at 350 psi for 30 minutes. No pressure loss was observed.
2. Deep vacuum draw
Once the leak was repaired, we connected our dual-stage vacuum pump , providing a vacuum down to -500 microns . This step is essential to remove all traces of moisture and air from the system, thus preventing the formation of acid in the compressor.
3. Recharge with R-410A refrigerant
We then proceeded to a complete recharge of the system following the manufacturer's nominal charge, i.e. 1.25 kg of R-410A, measured on an electronic scale. The operation was carried out with the greatest precision:
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Low pressure: 115 psi
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High pressure: 385 psi
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Blowing temperature: 11°C in cold mode after stabilization
These values confirmed a return to the original performance of the system.
Final checks and recommendations
After recharging, the Fujitsu heat pump resumed stable and quiet operation. The customer immediately noticed the difference: cooler air, normal power consumption, and an automatic compressor shutoff when the target temperature was reached.
We recommended to the client:
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Have the refrigeration connections inspected every year , especially during seasonal transitions.
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Keep the exterior base clean and clear , as debris and moisture can accelerate corrosion of copper tubing.
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Plan for annual AirGreen preventive maintenance , which includes checking pressures, cleaning coils and measuring delta T.
A typical intervention of AirGreen rigor in Laval
This repair perfectly illustrates our technical expertise and our commitment to the sustainability of HVAC systems . At AirGreen, we always prioritize the most reliable and cost-effective solution for our customers.
Our teams serve all of Laval , including Chomedey, Vimont, Sainte-Rose and Fabreville , as well as the North Shore and the South Shore for all your repair, maintenance or installation needs for Fujitsu, Gree, Midea, Sharp, Trane or Zephyr wall-mounted heat pumps .
By choosing AirGreen, each client benefits from field expertise, advanced diagnostic tools and local service across Greater Montreal.
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