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Réparation d’une thermopompe murale Sharp à Côte Saint-Luc
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Repair of a Sharp wall-mounted heat pump in Côte Saint-Luc

A service call in a modern condo in West Montreal

That day, our AirGreen team was called to a condo in Côte Saint-Luc where a Sharp wall-mounted heat pump was displaying an intermittent malfunction. The customer mentioned that the unit, installed above an interior door near the kitchen, was no longer blowing hot air despite a normal display on the remote control. This is a typical situation at the end of winter, when heating, ventilation, and air conditioning (HVAC) systems are in constant use.

Diagnosis: A temperature sensor and clogged drain problem

Upon our arrival, our certified technicians performed a thorough diagnosis . The Sharp device, a wall-mounted model from the ZU1 range , presented two clear symptoms:

  1. The heating mode would stop after a few minutes , despite an active compressor;

  2. Stagnant water was accumulating in the condensate tray, causing a slight leak on the wall.

Our checks quickly made it possible to isolate two main causes:

  • A faulty temperature sensor , sending a false reading to the electronic board;

  • A partially blocked condensate drain , preventing the water from draining properly.

Steps of repair

Our intervention procedure took place in several precise stages:

  1. Turn off the power supply and remove the front cover of the unit.

  2. Complete cleaning of the evaporator coil , using a biodegradable, no-rinse product.

  3. Replacement room temperature sensor , a genuine Sharp part compatible with the model.

  4. Clear the drain pipe using a condensate vacuum, followed by a flow test.

  5. Restart and calibration of the system , with reading of the supply and return temperatures.

Once the repair was completed, the heat pump returned to optimal performance : 42°C in heating mode, without fluctuation or premature shutdown.

Expertise and attention to detail: the AirGreen signature

At AirGreen , we emphasize preventative maintenance for wall-mounted HVAC systems. A simple drain obstruction or clogged sensor can lead to:

  • Unexpected shutdowns in heating mode;

  • Increased energy consumption ;

  • Risks of humidity in the walls.

Our technicians, trained on the biggest brands— Sharp, Gree, Fujitsu, Midea, Daikin, Goodman —use calibrated measuring instruments and original parts to guarantee reliable repairs.

Customer Care Tips

Before leaving the premises, we took the time to explain to the customer how to maintain her Sharp heat pump to prevent the problem from recurring:

  • Clean the internal filters every four weeks;

  • Check that the drain pipe remains free of obstruction;

  • Schedule an annual inspection before the heating season;

  • Avoid using chemicals to clean the coil.

These simple actions help extend the life of the heat pump and maintain high energy efficiency .

Result: comfort and peace of mind restored

A few hours after our intervention, the client confirmed that the heating was stable and quiet , with no leaks or shutdowns. Her living space was comfortable again, ready for the cool evenings of Montreal's spring.

Every day at AirGreen, we respond to similar calls in Côte Saint-Luc , Ville Mont-Royal , Laval and on the South Shore , where our priority remains the same: ensuring the performance and reliability of every HVAC system we maintain.