Daikin heat pump repair in Saint-Laurent
| Service | Repair | Unit | Heat pump |
|---|---|---|---|
| Brand | Daikin | Area | Saint-Laurent |
| Published | April 2, 2026 | Reading | 4 min |
Attachment 1 · job photo
Technical intervention in an underground car park: expertise and rigour from AirGreen
At AirGreen , we regularly receive service calls for Daikin units installed in complex environments. This week, our technical team visited an underground parking lot of a building in Saint-Laurent to diagnose a Daikin wall-mounted heat pump whose outdoor unit was exhibiting abnormal behavior.
The unit, installed on a wall mount with impact protection, exhibited a loss of heating performance and intermittent noise from the compressor. These signs, although subtle, indicated a possible refrigerant pressure problem or an obstruction to airflow in the condenser.
On-site diagnosis: rigor and method
Upon our arrival, our technicians conducted a complete visual inspection . The Daikin heat pump, carefully protected by a metal structure and insulating sleeves, was well maintained. However, a significant deposit of dust on the outdoor heat exchanger was significantly reducing air circulation.
Here are the key steps of the diagnosis :
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Complete electrical check : measurement of supply voltage, test of the starter relay and inspection of the control box.
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Analysis of the refrigeration circuit : monitoring of high and low pressures, detection of possible refrigerant leaks.
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Condenser fan test : Measure speed and current to confirm proper operation.
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Observation of automatic defrosting : simulation of cycles to ensure correct regulation in heating mode.
The verdict: A buildup of dirt on the fins and a slightly misadjusted temperature sensor caused the defrost mode to falsely activate . This resulted in a less stable heating cycle and frequent compressor shutdowns.
System repair and refurbishment
After explaining the situation to the client — the building manager — we undertook the complete repair of the system:
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Deep cleaning of the outdoor heat exchanger using a biodegradable product designed for HVAC coils.
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Delicate straightening of damaged fins to optimize heat exchange.
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Replaced the condenser temperature sensor to restore an accurate reading.
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R-410A refrigerant charge test.
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Final calibration of the electronic control module.
Each step was carried out with meticulous attention, in compliance with AirGreen procedures . We then carried out a complete test in heating mode , measured the blowing temperature and confirmed optimal performance .
Result: restored performance and assured reliability
Thanks to this intervention, the Daikin heat pump is now operating at full efficiency. The compressor runs quietly, defrosting occurs at the correct intervals, and the outlet temperature once again reaches the manufacturer's specifications.
The manager was impressed with the speed of our diagnosis , the cleanliness of the intervention and the detailed explanations provided on site. We also added a seasonal maintenance recommendation , to prevent the problem from recurring and ensure stable performance all year round.
Why entrust your Daikin system to AirGreen?
Like any HVAC appliance, a heat pump needs maintenance suited to its environment. In an underground parking garage , humidity, dust, and temperature can accelerate condenser fouling.
At AirGreen, we are trained to intervene in these demanding contexts:
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Qualified technicians experienced on most HVAC systems, including Daikin.
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Digital diagnostic tools to quickly detect hidden faults.
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Repair service in Montreal, Laval, Longueuil, North Shore and South Shore.
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Preventive maintenance tailored to the installation environment.
Each intervention results in increased performance , extended lifespan and optimal comfort for our residential and commercial customers.
AirGreen Tips: Maintaining Your Heat Pump Underground
We recommend following these few best practices:
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Regular cleaning of the coils at each change of season.
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Check compressor pressures and current once a year.
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Control of supports and mechanical protection against shocks.
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Inspection of drain pipes to prevent condensation water blockages.
These simple actions prevent the majority of breakdowns encountered on units installed in parking lots, technical rooms or basements.
AirGreen: your HVAC partner in Montreal and throughout Quebec
At AirGreen, every heat pump repair is an opportunity to demonstrate our expertise and commitment to customer satisfaction. Whether your system is a Daikin , Fujitsu , Midea , Gree , or Sharp model, we have the skills needed to ensure its long-term performance.
If you notice an unusual noise , a drop in efficiency or an error on the display , don't wait for the breakdown to get worse. Our teams intervene quickly in Montreal, Laval, on the North Shore and the South Shore , to restore your comfort and the tranquility of your building.
