| CAUSES | SOLUTIONS |
| No power to controller | Check the incoming power from the outlet or hardwired connections for 120VAC. Check fuse. |
| No power continued | Check fuse in the SL1600 inline fuse holder. Replacement fuse is 1A (Littlefuse #21800XP) slow blow for SL1600. Check the fuse light adjacent to the sliding door, green indicates fuse is good, red will indicate fuse is blown, replace with 1.5A (Littlefuse #576-031301.5HXP) slow blow for SL4800. |
| No 24V power from transformer | Replace controller. Likely short from the field wiring and solenoids. |