A service call in the middle of summer in Laval
When a Tosot wall-mounted heat pump breaks down on a sweltering July day, indoor comfort is quickly compromised. This is exactly the situation experienced by a family in Sainte-Dorothée, Laval , who contacted AirGreen after noticing that their outdoor unit was no longer blowing cold air and was making an abnormal noise. Our team quickly arrived on site to diagnose and repair this heating, ventilation, and air conditioning (HVAC) system.
A Tosot heat pump well integrated into its environment
The outdoor condenser, installed on the rear wall of the residence, was partially hidden by dense vegetation. Although the initial installation appeared compliant, the Tosot unit had to deal with reduced airflow due to the plants being too close. This often overlooked detail can lead to compressor overheating and a significant drop in energy efficiency.
Our technician began by thoroughly cleaning the area , making sure to clear the space around the suction and discharge grille. At AirGreen , we always remind our customers that the minimum recommended clearance around a wall-mounted condenser is at least 60 cm on each side to allow for adequate ventilation.
Technical diagnosis: an electronic card is the cause
After visual inspection and pressure testing, the compressor showed signs of intermittent starting. Using our digital analyzer , we were able to isolate the problem: a faulty electronic control board . This was sending irregular signals to the compressor and fan, causing the unit to go into safety mode.
We have taken the following steps:
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Power cut-off to secure the intervention area.
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Disassembly of the side panel of the Tosot unit.
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Visual and olfactory inspection of the electronic card (slight burning smell confirming the fault).
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Complete replacement of the Tosot control module with an original part supplied by our authorized distributor.
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Reconnect, calibrate and test voltage on each terminal.
Once the new board was installed, the unit restarted immediately with pressures within the manufacturer's specifications. The compressor ran smoothly and quietly—a sign that the fault was resolved.
Result: restored performance and comfort regained
In just a few hours, the Tosot wall-mounted heat pump was back to its original efficiency. The customer, who was worried about a complete system replacement, was relieved to learn that it was simply an electronic component that needed replacing , a cost-effective repair.
We took advantage of our visit to do:
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a complete cleaning of the outdoor coil using a biodegradable product,
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a R-410A refrigerant flow control ,
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and a check of communication between the indoor and outdoor units .
Preventive Maintenance Tips by AirGreen
Electronic failures on wall-mounted heat pumps, such as those of the Tosot brand, are often linked to:
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prolonged overheating due to poor clearance around the condenser;
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electrical voltage fluctuations not protected by a suitable differential circuit breaker;
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or even moisture infiltration into exterior electrical boxes.
At AirGreen , we recommend our clients to:
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keep vegetation at a reasonable distance;
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protect external connections with waterproof covers;
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and schedule an annual inspection of their HVAC system , ideally in the spring before the peak summer season.
Why choose AirGreen for your Tosot heat pump repair?
Our technicians are trained on all major brands on the market , including Tosot, Gree, Midea, Fujitsu, Sharp and Goodman . We respond quickly in Montreal, Laval, Longueuil, the North Shore and the South Shore , with original parts and procedures that comply with manufacturer recommendations.
Each intervention is documented in our system to ensure rigorous monitoring of the maintenance history , which allows our customers to extend the life of their device while optimizing its energy efficiency.
Conclusion: rapid and lasting intervention
Thanks to this targeted repair, the Sainte-Dorothée family was able to regain the comfort of their home without delay. The Tosot heat pump is now operating at full capacity, quietly and efficiently, ready to face hot days and cool autumn evenings. At AirGreen , each repair is also an opportunity to share best practices and ensure our customers lasting peace of mind .