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Réparation d’une thermopompe murale Carrier à Brossard
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Carrier wall-mounted heat pump repair in Brossard

A wall-mounted heat pump that no longer heats: diagnosis and repair by AirGreen in Brossard

At AirGreen , we often receive calls from customers whose wall-mounted heat pump seems to be working normally... but without actually producing any heat. This is exactly the case we recently encountered in Brossard , on the South Shore of Montreal , where a single-zone wall-mounted Carrier unit was showing very low efficiency in heating mode.

The context: a lack of heat at the start of the season

The owner of this single-family home noticed that his Carrier system started up fine, but the blown air remained lukewarm , even after several minutes of operation. No error codes appeared, which complicated the initial diagnosis. In this type of situation, several causes can be considered:

  • a gradual refrigerant leak ;

  • a stuck reversing valve ;

  • a faulty temperature sensor ;

  • or even an electronic card which no longer controls the compressor correctly.

Inspection and testing carried out by AirGreen

Our technicians began with a complete check of the R-410A refrigerant pressure . This was found to be abnormally low, confirming the presence of a slow leak in the circuit. Using an electronic leak detector , the problem area was located at the rear of the outdoor unit, on a poorly sealed brazed connection .

While waiting for the vacuum to be drawn, our team also carried out:

  • a complete cleaning of the indoor coil , removing dust and obstructions that were hindering air circulation;

  • a check of the return temperature sensor , which showed a slight reading drift;

  • and an inspection of the condensate drain , often neglected but essential to prevent water leaks.

Repair: thoroughness and efficiency

Once the leak is repaired, our technicians:

  1. Performed a complete vacuum draw of the system , in order to eliminate all traces of humidity and air.

  2. Recharged the system with the exact amount of R-410A specified by the Carrier manufacturer.

  3. Replaced the interior temperature sensor with an original part.

  4. Conducted full operational tests , comparing pressures and temperatures to reference values.

The results were conclusive: the heat pump immediately regained its optimal thermal efficiency , with a hot and stable blowing .

Result: comfort restored and performance guaranteed

Thanks to this intervention, the Brossard home regained uniform thermal comfort , with no temperature variations between rooms. The owner, who was worried about a complete replacement of the unit, was delighted to learn that the repair was enough to extend the life of the system by several years.

The noise level of the wall unit has also improved thanks to the complete cleaning and realignment of the motorized shutters.

Recommended maintenance for Carrier wall-mounted heat pumps

To avoid this type of breakdown, we recommend to our customers in Brossard, Longueuil, Montreal and Laval :

  • to have the air filters cleaned every two months during the heating season;

  • to schedule an annual inspection of the refrigeration circuit and the control board;

  • and have the refrigeration connections checked to prevent long-term leaks.

Preventive maintenance always costs less than a breakdown in the middle of winter, and it helps ensure maximum energy efficiency .

AirGreen Expertise: Custom HVAC Repairs in Brossard and Throughout the South Shore

At AirGreen , every job is performed by certified technicians who specialize in wall-mounted HVAC systems . We repair all major brands— Carrier, Gree, Sharp, Fujitsu, Midea, Daikin, Goodman, Bosch, Zephyr , and more.

We make it a point of honor to:

  • diagnose accurately before replacing parts;

  • use original parts to ensure durability;

  • and inform our customers about good maintenance practices to extend the life of their devices.

Conclusion: a Carrier heat pump like new

This Carrier wall-mounted heat pump repair in Brossard demonstrates how accurate diagnosis and careful intervention can bring a high-performance HVAC system back to life. At AirGreen, we believe that every repair is an opportunity to improve the comfort, reliability, and durability of our customers' equipment.

Summary of the intervention:

  • Device type: Wall-mounted heat pump (mini-split)

  • Brand: Carrier

  • Location: Brossard, South Shore of Montreal

  • Problems found: Refrigerant leak and faulty sensor

  • Solutions: Repair the connection, replace the sensor, completely clean it, recharge it with R-410A

  • Result: Heating restored, noise reduced, optimal comfort