| 1 | The relay has two different detection modes. | |
| 2 | Only one relay is closed at any time. | |
| 3 | Clean and dry electrical controls and pressure switches. Check all wiring for short circuits. | |
| 4 | Test and set switch gear and circuit breaker relays for proper coordination. | |
| 5 | The boards are often placed in a mainframe that electronically controls the opening and closing of the relays. |