DAB Inverter Switching Noise / Possible Inverter Stress

Pump runs but makes a high‑pitched whine from the inverter/control area (variable‑speed models)

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Normal PWM switching noise at certain speeds, Loose mounting of DAB control module, Failing inverter components under load

Safety first: Turn off power before touching the control module.

Steps to check:

Determine if noise is normal: Some high‑frequency noise is normal at specific speeds. Compare with manufacturer notes or similar units.
Secure control module: Tighten mounting screws and ensure the control housing is not vibrating.
Monitor operation: If noise is accompanied by overheating, errors, or erratic speed, stop using the pump.
Service inverter: Have a DAB service technician test the inverter/control module and replace if necessary.

Medium 3/5

DAB inverter/control module

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