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Réparation d’une thermopompe murale Mitsubishi Electric à Côte-des-Neiges–Notre-Dame-de-Grâce
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Repair of a Mitsubishi Electric wall-mounted heat pump in Côte-des-Neiges–Notre-Dame-de-Grâce

When a Mitsubishi Electric heat pump shows signs of fatigue

At AirGreen , we often receive service calls related to Mitsubishi Electric systems, which are renowned for their reliability. Yet, like any HVAC unit, even the best models sometimes require expert attention. This is exactly what happened recently in the Côte-des-Neiges–Notre-Dame-de-Grâce neighborhood of Montreal , where a customer contacted us after noticing that their wall-mounted heat pump was no longer heating properly, despite an abnormal noise from the outdoor fan.

Our team responded quickly to diagnose and repair the situation.

On-site diagnosis: a ventilation and location problem

Upon our arrival, we noticed that the outdoor unit, a Mitsubishi Electric model from the MUZ range , was installed under a concrete balcony. This positioning, although practical for protection against rain, posed a major air circulation problem here. The lack of space above and around the unit limited its heat exchange , forcing the compressor to work harder, which explains the excessive vibrations and loss of performance .

After an initial operational test, our technicians confirmed that:

  • The condenser fan was struggling to maintain airflow.

  • The evaporator coil was partially clogged with dust and debris.

  • The outside temperature sensor was sending incorrect values, distorting the regulation of the defrost cycle.

Steps of the repair carried out by AirGreen

Our technicians carried out a series of meticulous interventions:

1. Complete cleaning of the outdoor condenser

We removed the front grille and cleaned the coil using a biodegradable cleaner designed for aluminum surfaces. The fan was inspected and balanced to eliminate the slight misalignment responsible for the observed noise.

2. Replacing the temperature sensor

The faulty sensor, causing excessive defrosting, was replaced with a genuine Mitsubishi Electric part, calibrated to the manufacturer's specifications.

3. Adjusting the installation

We recommended and implemented a correction to the unit's location : moving it 20 cm forward and installing an anti-vibration plate . This modification immediately improved ventilation and reduced operating noise.

4. Checking the refrigerant level

A pressure test confirmed a slight lack of R-410A . We performed a precise top-up after checking for leaks.

Result: a quieter and more efficient heat pump

After our interventions, the system returned to optimal performance:

  • Heating restored to 100% of nominal capacity .

  • Exterior noise reduced by 40% .

  • Stabilized defrost cycles.

  • Reduced energy consumption.

The customer, who was worried about having to replace the entire system, was able to keep his heat pump in perfect condition, for a much lower cost than a new installation.

AirGreen tips to avoid this type of problem

To ensure the durability and performance of your Mitsubishi Electric wall-mounted heat pump, we recommend:

  1. Check the ventilation around the outdoor unit : at least 30 cm of free space on the sides and 60 cm above.

  2. Clean the internal filters every two months .

  3. Schedule annual preventative maintenance in the spring or fall.

  4. Avoid closed shelters : even if they protect from snow, they can block heat dissipation.

AirGreen expertise in Montreal and on the North and South Shores

This intervention clearly illustrates the importance of calling on certified HVAC experts . At AirGreen, our technicians have in-depth knowledge of Mitsubishi Electric, Gree, Fujitsu, Sharp, Midea, Zephyr systems, and many others. Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we ensure fast, precise and durable repairs .

Thanks to our approach focused on transparency and performance , each client benefits from reliable service, with complete follow-up after intervention.

Conclusion: comfort rediscovered in Côte-des-Neiges

This Mitsubishi Electric wall-mounted heat pump repair demonstrates how thorough diagnosis and precise adjustments can transform the performance of an HVAC system. By choosing AirGreen , you benefit not only from recognized technical expertise, but also from human and professional support, serving your comfort all year round.

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