Help Please - Aux Relays Not Working
- By 81david
- Pool Automation
- 37 Replies
Thanks @Jimrahbe for the detailed step by step guide I appreciate it.
Checked voltages of all three relays all have 120v at the line side. Flipped all three on one by one and tested the load side all of which have no voltage showing (0.11 or so).
Aux 1 is pool lights
Aux 2 is spa lights
Aux 3 is blower for spa
4 other relays have nothing coming in and no power to them from the breakers.
The “dip switches” I was referring to are the two ULN2803 relay driver Chips on the main board. They were $7 on Amazon for 10 of them and same night I had the issue there was lightning in the distance and some neighbors were talking about power surges. I took a shot here I know.
Here is a picture of inside my panel as well. Bunch of ants in there but do not see any frayed wires or burn marks on anything.

Checked voltages of all three relays all have 120v at the line side. Flipped all three on one by one and tested the load side all of which have no voltage showing (0.11 or so).
Aux 1 is pool lights
Aux 2 is spa lights
Aux 3 is blower for spa
4 other relays have nothing coming in and no power to them from the breakers.
The “dip switches” I was referring to are the two ULN2803 relay driver Chips on the main board. They were $7 on Amazon for 10 of them and same night I had the issue there was lightning in the distance and some neighbors were talking about power surges. I took a shot here I know.
Here is a picture of inside my panel as well. Bunch of ants in there but do not see any frayed wires or burn marks on anything.
