Home » Some of Our Service Calls in Greater Montreal » Repair of a Daikin wall-mounted heat pump in Saint-Bruno
Réparation d’une thermopompe murale Daikin à Saint-Bruno
Reading time: 4'

Repair of a Daikin wall-mounted heat pump in Saint-Bruno

Heat pump failure in the middle of summer in Saint-Bruno

One particularly hot June morning, a customer in Saint-Bruno , on Montreal's South Shore , contacted us: his Daikin Inverter wall-mounted heat pump was no longer producing cold air. The outdoor fan seemed to be working, but the air blown inside remained lukewarm. With temperatures exceeding 30°C, it was urgent to restore comfort to the home.

At AirGreen , we know that a proper diagnosis is the key to an effective repair. So, we dispatched one of our CMMTQ-certified technicians to the site for a complete system inspection.

Diagnosis: a refrigerant leak and a clogged condenser

Upon arrival on site, our technician carried out a basic check:

  • the electrical current reached the outdoor unit;

  • the compressor started;

  • but the pressure of the R-410A refrigerant was abnormally low.

Upon observing the condenser, we noticed that the suction pipe showed traces of oil and dust , a typical sign of a refrigerant micro-leak . In addition, the condenser grille was partially clogged with plant debris that had accumulated over time, significantly reducing heat transfer.

Intervention: complete refurbishment of the heat pump

Our specialists undertook the repair in several precise stages:

  1. Thorough cleaning of the outdoor condenser using a high-efficiency biodegradable product to restore optimal airflow.

  2. Leak detection using an electronic detector and nitrogen test. The leak came from a slightly loose flare fitting in the liquid line.

  3. Tightening and replacement of the seal , followed by a complete vacuum of the circuit.

  4. Recharge the system with the exact amount of R-410A refrigerant according to Daikin specifications.

  5. Performance test in cooling and heating mode to ensure proper operation of the inverter.

Final measurements showed a return to perfect nominal pressures and an evaporator outlet air temperature of 8°C , confirming that the heat pump was once again operating at full efficiency.

A repair that highlights the importance of regular maintenance

This breakdown is a classic example of the consequences of a lack of annual maintenance . Even top brands like Daikin require preventative maintenance to avoid performance losses and micro-leaks.

At AirGreen, we recommend:

  • a complete cleaning of the condenser and the wall unit at least once a year;

  • a refrigerant pressure check every two years;

  • and a visual inspection of the insulated conduits to detect any premature wear.

Simple preventative maintenance often costs much less than a full refrigerant recharge and avoids excess energy consumption.

Customer testimonial: comfort and efficiency restored

After the repair, the customer told us that his heat pump had never been quieter since its installation. Cold air was once again circulating evenly throughout the house, and electricity consumption had even decreased by 15%, according to the meter's initial estimates.

We also insulated the refrigerant line with high-density foam insulation to prevent condensation and ensure better durability.

Why choose AirGreen for your Daikin heat pump repairs?

Our interventions are based on local expertise , ongoing training and total transparency . Each service call is documented with photos, measurements and personalized recommendations.

At AirGreen , we:

  • We intervene quickly throughout Greater Montreal, Laval, Longueuil, North Shore and South Shore ;

  • use only original spare parts to ensure reliability;

  • We provide accurate diagnostics with certified instruments for Inverter and MultiZone systems.

Whether it is a refrigerant leak , an electronic card failure , or a silent but inefficient inverter compressor , our technicians know how to identify the exact cause of the problem and correct it permanently.

Final result: a high-performance heat pump and a worry-free customer

Thanks to a thorough and rapid repair , the customer's Daikin wall-mounted heat pump in Saint-Bruno now works like new. The system delivers consistent comfort, in both cooling and heating modes, while maintaining optimal energy consumption .

This intervention perfectly illustrates AirGreen's mission: to ensure comfort, reliability and peace of mind to every home served in the greater Montreal area.