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Duco malfunction

Duco ventilation unit no longer running

Is your Duco ventilation unit or HRV unit not running at all anymore? The cause could be the motor, bearings, circuit board, power supply, or control system. In many cases, repair or overhaul is still possible.

Problem Motor no longer running
  • No air movement
  • Motor does not start up
  • Motor overhaul often possible
Start troubleshooting

What do you notice?

  • The ventilation unit no longer responds.
  • There is no or hardly any air movement.
  • The motor tries to start but doesn't get going.
  • The ventilation unit remains completely silent or only hums.

Possible causes

  • Defective or seized motor.
  • Worn bearings or stiff-running components.
  • Problems with the circuit board, power supply, or control system.
  • Wear or fouling of the ventilation motor.

What can you check yourself?

First, check if the ventilation unit is receiving power and if the controls are working correctly. Listen if the motor remains completely silent or tries to start up. Always disconnect the power to the ventilation unit before opening or inspecting it.

Not sure where the malfunction is?

Use our troubleshooting guide to determine step-by-step which cause best fits your Duco ventilation system.

Start the troubleshooter

Can the motor still be repaired?

In many cases, yes. When the motor, bearings, or rotating parts are defective, overhaul can often be an economical and sustainable solution. Only in cases of severe damage or irreparable parts is full replacement necessary.

Choose the right solution

Duco motor overhaul View repairs → More about Duco overhaul View overhaul page →

Read more about Duco

Also view our other information pages about Duco ventilation units, HRV units, parts, malfunctions and overhauls.

Duco ventilation units Main page of the Duco knowledge center Mechanical ventilation units DucoBox Silent, Focus, Reno and motor overhaul HRV units DucoBox Energy Comfort, Premium and Sky Duco overhaul Everything about motor overhaul and repair Duco parts Motors, circuit boards, sensors, filters and parts Duco makes noise Sound, vibrations and wear Duco hums Constant humming or resonance Duco no longer running Motor does not start or respond Duco doesn't extract well Poor extraction or moisture problems Duco bearings worn Grinding or screeching motor due to wear

Is your problem or model not listed?

Use our troubleshooter or parts finder. We are happy to help you find the right solution for your Duco ventilation system.

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