A service call for sudden loss of performance
At AirGreen , we regularly work on Tosot HVAC systems , a brand known for its reliability and excellent value for money. This service call in Sainte-Thérèse , on the North Shore of Montreal , concerned a Tosot inverter wall-mounted heat pump that was no longer able to maintain the desired temperature. The customer had noticed that the blown air remained lukewarm despite continuous operation of the indoor fan.
On-site diagnosis: a refrigerant charge problem
Upon our arrival, we carried out the basic checks:
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Suction pressure lower than normal,
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No frost on the pipe ,
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Constant compressor noise , without abnormal cut-out.
These observations pointed to a partial loss of R-410A refrigerant , probably due to a microleak at the external flare fittings.
We installed our digital manifold to confirm the diagnosis, as seen in the photo: the pressures were clearly below the expected values for an ambient temperature of 24°C.
Technical steps of the repair
1. Leak detection and sealing
After inspection with foam solution, a slow leak was detected on the suction connection . We have:
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Tightened and re-did the flare joint using a calibrated tool,
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Applied an approved HVAC sealant ,
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Checked the integrity of the liquid line and the condensation drain.
2. Vacuuming and recharging the system
Once the circuit was sealed, we carried out a complete vacuum to eliminate any traces of humidity or air in the system.
Next, we recharged the heat pump with the exact amount of R-410A refrigerant according to the specifications of the Tosot Inverter unit.
The final measurements showed:
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Suction pressure : 120 psi,
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Discharge pressure : 370 psi,
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Indoor blowing temperature : 10.8°C.
Everything indicated a return to optimal performance.
3. Complete performance check
We let the system run for 25 minutes to observe the cycles and ensure that no pressure variations occurred.
The client immediately noticed an improvement in comfort in the main room, where the temperature dropped by 3°C in less than 10 minutes.
The strengths of the AirGreen intervention
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Roof repairs performed safely with our unit support and calibrated tools.
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Accurate refilling in compliance with Tosot guidelines and environmental standards.
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Complete performance control with detailed explanation to the customer.
Every detail counts: a single loose connection can compromise the entire system. Thanks to our methodical approach, we were able to avoid premature compressor replacement and extend the equipment's lifespan.
Maintenance tips to extend the life of a Tosot heat pump
Our technicians recommend to all owners of Tosot wall-mounted heat pumps:
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To have refrigerant pressures checked every two years,
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To clean the internal filters every month during the summer season,
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Avoid leaving the system running at maximum temperature for long periods without maintenance,
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And above all, have the exterior fittings inspected after each winter, because freeze-thaw cycles can loosen them.
Professional service across the North Shore
This intervention at Sainte-Thérèse illustrates our philosophy well: each service is a combination of technical expertise, rigor and transparency .
Whether in Montreal, Laval, Longueuil, or on the North Shore , we offer the same level of care and professionalism.
Our customers choose AirGreen for:
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Our rapid and precise diagnosis ,
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Our certified parts and tools ,
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Our reliable and responsive after-sales service .
Conclusion: efficiency found for a Tosot heat pump
After our intervention, this Tosot Inverter wall-mounted heat pump is once again operating at full capacity, providing optimal comfort and improved energy efficiency.
Thanks to careful repair and precise recharging, the Sainte-Thérèse customer regained stable and quiet performance , while avoiding a major expense.
At AirGreen, every HVAC repair is a guarantee of restored comfort and extended reliability.