My central exhaust unit (ULV, USV, USVX) does not run at all speed levels – what could be the cause?
If a central exhaust unit only operates at certain speed levels, or does not change speed as expected, this may indicate a component fault in the motor control. This is a known issue with older central exhaust models.
Answer:
If a central exhaust unit of type ULV, USV or USVX does not operate at all speed levels, the most likely cause is a defective run capacitor. A local, authorised electrician can assist with replacing this component. The run capacitor has article number 101318 and is installed in the controller box near the motor.