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Réparation d’une thermopompe centrale York à Fabreville
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Repair of a York central heat pump in Fabreville

A frozen heat pump: a signal to never ignore

At AirGreen , we were recently called to repair a York central heat pump in a residential area of ​​Fabreville, Laval . The customer had noticed an abnormal buildup of frost on the outdoor condenser , accompanied by a noticeable drop in heating performance.

This type of symptom— persistent frost or ice patches on the top or front grille —often indicates a defrost or airflow problem.

Initial diagnosis: understanding the cause of frost

Upon our arrival, our certified technician carried out a complete inspection:

  • Checking the discharge temperature and suction pressure .

  • Observation of the electronic module defrosting sequence.

  • Inspect coils for dirt or residual oil .

The diagnosis revealed:

  1. A faulty defrost sensor (thermistor) , preventing the automatic sequence from engaging correctly.

  2. A slight buildup of debris on the condenser fins , reducing airflow.

These two elements combined explained the abnormal frost observed on the surface of the York condenser.

Intervention: sensor replacement and complete cleaning

Our technicians have undertaken the following steps:

  • Safe disconnection of the system and recovery of the refrigerant in a certified cylinder.

  • Replacement of the defrost sensor with an original York part, perfectly calibrated to the system.

  • Complete cleaning of the outdoor coil using a non-corrosive biodegradable product.

  • Check the fan to ensure there is no imbalance or obstruction.

  • Recharge the refrigerant according to the pressures recommended by the manufacturer.

Each intervention was carried out in compliance with the TSSA and CSA standards in force for HVAC systems.

Performance testing and validation

Once the repair was complete, we launched a full test cycle:

  • The defrost cycle started automatically after 35 minutes of operation.

  • The observed pressures and temperatures were stable and consistent .

  • The compressor and fan operated without vibration or abnormal noise .

We also checked the indoor airflow , confirming that comfort was fully restored.

Results obtained

Thanks to this intervention:

  • The York heat pump has regained its full heating capacity .

  • The household's electricity consumption has decreased thanks to an efficient defrost cycle .

  • The customer now benefits from a quieter and more durable system .

Our team took care to explain to the owner the signs to watch for to prevent any return of the problem:

  • Persistent frost formation.

  • Outdoor fan stops spinning.

  • Warm or cold air blown inside.

AirGreen expertise at your service

At AirGreen , we understand that a central heat pump represents a major investment. That's why every intervention is carried out with rigor, precision and transparency .
Our technicians have the tools and training to diagnose and repair all major brands : York, Lennox, Trane, Goodman, Midea, and many more.

We respond quickly throughout the Greater Montreal region — Montreal, Laval, Longueuil, North Shore and South Shore — to ensure our customers optimal comfort in all seasons .

In conclusion

This York central heat pump repair in Fabreville perfectly demonstrates our commitment to quality and performance. Thanks to an accurate diagnosis and careful repair, the customer's home now benefits from stable, energy-efficient, and reliable heating for Quebec winters.