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Réparation d’une thermopompe murale Coaire à Boisbriand
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Repair of a Coaire wall-mounted heat pump in Boisbriand

A service call on the North Shore: loss of heating performance

At AirGreen , we were called to work on a Coaire wall-mounted heat pump installed on a residential building in Boisbriand , on the North Shore of Montreal . The customer noticed that his system was no longer heating adequately despite the indoor unit apparently operating normally. The blown air was lukewarm, and the ambient temperature no longer exceeded 18°C, even after several hours of operation.

On-site diagnosis: lack of pressure in the refrigeration circuit

Upon our arrival, our technicians observed several important clues:

  • The compressor was starting correctly, but the pressure measured on the pressure gauge was too low.

  • The outdoor unit showed irregular frost marks on the coil.

  • A slight odor of refrigerant oil was noticeable near the fittings.

We therefore undertook a leak test using an electronic detector and a nitrogen tracer. The diagnosis was confirmed: a micro-leak on the liquid line , at the flare connection. This type of leak is common on units installed for several years, especially when the screws or joints are not tightened after the repeated freeze-thaw cycles typical of the Quebec climate.

System Repair and Recharge Steps

The repair took place in several methodical phases:

  1. Complete draining of residual refrigerant into a recovery bottle.

  2. Flare replacement and fitting cleaning with dry nitrogen.

  3. Pressure test at 300 psi to ensure the circuit is leak-proof.

  4. Complete vacuum extraction until reaching -29 inHg for 45 minutes.

  5. Recharge with R-410A refrigerant according to Coaire manufacturer specifications.

Once the system was powered back up, we observed:

  • Perfectly balanced pressure .

  • An indoor blowing temperature rapidly rising from 17°C to 28°C.

  • Stable energy efficiency , without compressor fluctuation.

Additional maintenance recommended

Since the customer hadn't had their system serviced in over two years, we took advantage of the visit to thoroughly clean the outdoor coil and indoor filter. This type of maintenance improves performance and prevents the compressor from overheating.
Our recommendations:

  • Check the refrigeration pressure every year.

  • Cleaning the coils twice a year (spring and fall).

  • Inspect fittings and insulation before winter to prevent future leaks.

Coaire's reliability and AirGreen's expertise

Coaire wall-mounted heat pumps offer good value for money, but require careful gas charge calibration and constant leak monitoring. With our precise diagnostic tools and certified procedures, we ensure long-lasting repairs that comply with Quebec HVAC standards .

Each AirGreen intervention is distinguished by:

  • Certified technicians who receive regular training on Asian brands such as Coaire, Gree, Midea and Fujitsu.

  • Original replacement parts .

  • Fast service covering all of Greater Montreal, including Laval, Longueuil, the North Shore and the South Shore .

Final result: comfort and efficiency restored

At the end of the service, the Coaire heat pump was working perfectly. The customer immediately noticed an increase in indoor temperature and a reduction in startup noise . We left a complete pressure and temperature report for their service record, a testament to AirGreen's transparency and professionalism.

This repair once again illustrates our commitment: to ensure the reliability and optimal performance of each residential HVAC system installed in Quebec, regardless of the brand.