Certikin Thermal Overload Cycling

Pump will not restart after being stopped when hot, but starts again after cooling down.

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

Motor running near or above rated current, inadequate ventilation, failing thermal overload, high ambient temperature

Safety: Isolate power before opening any covers.

Measure current: Use a clamp meter to check that running current does not exceed the Certikin motor rating.
Improve cooling: Ensure the plant room is ventilated and that the motor cooling fins are clean.
Check overload setting: Verify that the overload relay in the control panel is correctly set to the motor full‑load current.

If the motor is correctly loaded but still overheats, the motor windings may be deteriorating and the motor should be replaced.

Medium 3/5

Certikin overload relay

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