To verify that the low‑oil float switch operates correctly:

1. Power off the machine: Lock‑out and tag‑out electrical power to prevent accidental start‑up while testing.

2. Locate sensor wiring: Trace the wires from the float sensor to the electrical connector or terminal block. Disconnect the sensor from the control circuit.

3. Use a multimeter: Set a multimeter to the continuity or resistance (ohms) setting. Place the meter leads across the two sensor wires.

4. Move the float: Manually raise and lower the float inside the reservoir while watching the meter. When the float is above the low‑level position (normal oil level), the switch should be open (infinite resistance/no continuity). When the float drops to the low‑level position, the switch should close (show continuity).

5. Interpret results: If the meter reading does not change as the float moves, the sensor may be faulty and should be replaced.

6. Reconnect and test system: Reconnect the sensor wiring and restore power. Verify that any low‑oil warning indicator or control interlock operates when the reservoir is intentionally lowered below the MIN mark.

Purpose