Pump will not start at all, no humming, no movement, but power is present at the plant room.

Safety: Only a competent person should work on live circuits. Isolate whenever possible.

• Check isolator: Confirm the Certikin pump isolator is in the ON position and functioning. Replace if the handle feels loose or the contacts are burnt.
• Inspect control panel: Open the panel and check that the pump contactor pulls in when START is pressed. If not, test the coil and control circuit.
• Overload relay: Reset the thermal overload relay associated with the pump. If it trips again immediately, investigate motor current draw.
• Test motor windings: With the motor disconnected and power isolated, measure resistance across windings. Infinite resistance indicates an open winding and the motor must be replaced.