Certikin Chattering or Undervoltage on Contactor Coil

Pump runs but there is a noticeable electrical buzzing from the control panel contactor.

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

Low control voltage, worn contactor coil, loose coil terminals, incorrect coil voltage rating fitted

Safety: Isolate the control panel before working inside.

Measure coil voltage: Confirm that the contactor coil is receiving the correct control voltage when energized.
Tighten terminals: Check and tighten coil and auxiliary contact wiring.
Replace contactor: If buzzing persists with correct voltage, replace the contactor with a like‑for‑like unit specified for the Certikin pump.

Medium 3/5

Certikin pump contactor

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