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Réparation d’une thermopompe centrale Quietside à Sainte-Thérèse
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Repair of a Quietside central heat pump in Sainte-Thérèse

When a heat pump goes silent: a quick diagnosis on a residential roof

It was a sunny spring morning in Sainte-Thérèse , on Montreal's North Shore , when our AirGreen team received an emergency call from a concerned customer. Their Quietside central heat pump was refusing to start after a prolonged period of freezing temperatures. The outdoor unit, installed on the upper deck of a multi-family residence, seemed intact at first glance—but no compressor noise or fan could be heard.

Initial inspection: a silent system… but not dead

Upon our arrival, we observed two Quietside outdoor units:

  • A small wall unit installed on a wall bracket (side area).

  • A larger main unit , placed on a raised metal platform.

This type of hybrid configuration is typical of a MultiZone system combining a central heat pump and one or more secondary wall units, making it possible to serve multiple comfort zones in the home.

Our first step: check for voltage at the compressor and main fan inputs. Result: correct voltage. Next, test the control signal : absent. This indicated a likely fault with the outdoor electronic board , which is responsible for communication with the indoor unit.

Diagnosis confirmed: a corroded external control board

By opening the electrical panel of the main unit, we found the cause of the problem:

  • Control board oxidized at several connection points.

  • Swollen start capacitor , affecting fan start-up.

  • Accumulation of dust and moisture due to insufficient ventilation under the metal shield.

After discussion with the customer, we carried out a complete and preventive repair .

Repair steps: AirGreen precision and rigor

  1. Safe disconnection of the power supply.

  2. Removal of the original Quietside control board , thorough inspection and replacement with a compatible module.

  3. Replacement of the starting capacitor (same capacity, 45/5 µF).

  4. Complete cleaning of the outdoor unit , including the fins, the housing, and the connectors.

  5. Checking inter-unit communication with the satellite wall unit.

  6. Restart and calibrate the automatic defrost cycle .

Result: a quieter and more efficient heat pump than before

After powering up, the system came back to life. The compressor started smoothly , the discharge pressure stabilized at 260 psi , and warm air was once again circulating through the interior ducts.

The customer, surprised by the speed of the repair, noted that the system seemed even quieter than before the failure. We confirmed that the new capacitor and updated circuit board slightly reduced startup vibrations.

Lessons learned: maintaining and protecting outdoor units

This intervention highlights an essential point: outdoor electronic cards are sensitive to humidity, especially when installed on terraces exposed to the elements.
Our recommendations for owners of Quietside heat pumps and other brands:

  • Have electrical connections inspected every spring .

  • Install additional protection against water and snow (awning, rain shield).

  • Clean the coils and base of the unit to prevent debris buildup.

  • Check metal fasteners and supports , as vibrations can accelerate corrosion.

AirGreen: Your Trusted HVAC Partner on the North Shore and in Montreal

At AirGreen , we repair and maintain all central and MultiZone heat pumps , including Quietside, Midea, Fujitsu, Gree, Goodman and Lennox brands.
Our certified technicians respond quickly in Montreal, Laval, Longueuil, the South Shore and the North Shore for:

  • accurate electronic diagnostics ;

  • repairs on board and engine ;

  • professional cleaning adapted to the configuration of each roof or balcony;

  • and personalized advice to extend the life of your equipment.

Our priority: ensuring the reliability and performance of your HVAC systems, whatever their brand or age.

Conclusion: another system saved by AirGreen know-how

Thanks to targeted intervention and excellent coordination, this Quietside central heat pump in Sainte-Thérèse is back for several seasons of comfort. By replacing only the necessary parts, we allowed our client to extend the life of their system while avoiding a significant expense.

This is exactly what defines our mission at AirGreen: to repair smartly, so that every home remains comfortable and energy efficient all year round.