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Réparation d’une thermopompe murale Zephyr à Sainte-Thérèse
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Repair of a Zephyr wall-mounted heat pump in Sainte-Thérèse

A service call for a broken Zephyr wall-mounted heat pump

At AirGreen , we regularly receive requests for troubleshooting on wall-mounted heat pumps installed in single-family homes on the North Shore . This time, our team went to Sainte-Thérèse , where a customer was experiencing a problem with their Zephyr wall-mounted heat pump .

The main symptom: the indoor unit was working, but no cold air was coming out despite the correct settings on the remote control. This type of failure is common when the weather returns and is often caused by a communication fault between the units or a partial loss of refrigerant.

Precise diagnosis carried out on site

Upon our arrival, we undertook a complete system diagnosis , an essential step in identifying the real cause of the problem. The Zephyr heat pump was installed in a bright living room, above a cabinet containing kitchen appliances and household accessories. Here's how we proceeded:

  1. Checking the operating mode and remote control
    The unit was responding fine, but the temperature was not dropping. A manual test confirmed that the outdoor compressor was not starting .

  2. Inspection of communication between units
    We used our multimeter to check the voltage between the signal terminals. The result: intermittent loss of communication caused by a slightly corroded wire in the cable connecting the units.

  3. Checking the R-410A refrigerant level
    After repairing the wire, we connected our pressure gauges to check the circuit pressure. It turned out to be lower than normal , indicating a small refrigerant leak .

  4. Leak search
    Using an electronic detector, we located a micro-leak in the Schrader valve of the outdoor condenser. A slow leak, but enough to affect cooling performance.

Repair carried out by our AirGreen technicians

The intervention took place in several meticulous stages:

  • Replacement of the communication cable between the indoor and outdoor units.

  • Repair of the faulty Schrader valve , followed by a nitrogen leak test to confirm no further leaks.

  • Complete system vacuum to -500 microns to remove all traces of moisture.

  • Recharge with R-410A refrigerant according to Zephyr model factory specifications.

  • Cleaning the filter and the interior evaporator , using a biodegradable solution to eliminate dust and bacteria.

  • Complete performance test : air conditioning, heating and dehumidification mode.

After restarting, the system returned to optimal performance , blowing air at 8°C at the evaporator outlet. The customer immediately felt the difference: restored thermal comfort and quiet operation, typical of well-maintained Zephyr systems.

Maintenance advice given to the customer

We took advantage of our visit to remind the customer of some good maintenance practices :

  • Clean the air filters once a month during the warm season.

  • Avoid obstructing air outlets with objects or furniture.

  • Monitor for any performance variations or unusual noises .

  • Schedule annual AirGreen maintenance to prevent leaks, dirt buildup and electronic failures.

These simple actions ensure maximum energy efficiency and extend the life of the heat pump, while maintaining healthy indoor air.

AirGreen expertise at your service on the North Shore

Whether in Sainte-Thérèse , Boisbriand , Blainville or Terrebonne , our AirGreen technicians respond quickly to all your HVAC repair needs:

  • Wall-mounted and central heat pumps

  • Residential and commercial air conditioners

  • MultiZone Systems

  • Air exchangers and ventilation accessories

Our priority remains the same: to offer a professional, sustainable and transparent service , based on rigorous diagnosis and quality repair.

Each AirGreen intervention concludes with a complete system check and personalized follow-up, guaranteeing your peace of mind.

Conclusion: A Zephyr heat pump restored to full efficiency

Thanks to a quick and precise intervention, our team enabled this Zephyr wall-mounted heat pump to resume service in optimal conditions. The Sainte-Thérèse customer regained immediate comfort, without having to consider a costly replacement.

At AirGreen , we believe that a well-executed repair extends the life of your HVAC systems while promoting energy savings. If your unit is showing signs of weakness or is no longer producing cold air, contact our team today —we operate throughout Montreal, Laval, Longueuil, the North Shore, and the South Shore .