How to Fix / Troubleshooting

Safety first: Turn off power at the breaker before opening any covers. Arcing can cause fire.

Inspect terminals: Open the Emaux pump terminal box and check all screw terminals for tightness. Tighten gently but firmly.
Look for burn marks: Any blackened or melted plastic around terminals indicates arcing; replace the terminal block or affected components.
Check relays/contactors: If the buzzing comes from a relay or contactor in an external control panel, inspect and replace if contacts are pitted or burnt.
Re-test: After tightening and replacing damaged parts, restore power and listen for any remaining abnormal sounds.

If buzzing persists, have a qualified electrician evaluate the system to prevent potential fire hazards.

Pump runs but there is a persistent electrical buzzing or arcing sound from the control box or terminal area.

Possible Causes