30
M820 pH/Dual ORP Controller Owner’s Manual
F. Feeder not operang
1. No Flow: Flow light LED must be on.
2. Inadequate Flow: Check ow through the ow cell and
controller.
3. Blown output fuse in the controller: Replace fuse.
G. Flow LED o
1. Verify that all appropriate valves are open.
2. Verify that there is sucient pressure in the line. Close right
side valve slightly if necessary.
3. Verify that the ow switch is securely connected to the
controller terminals.
4. Both the pH and ORP dose outputs are disabled if the green
Flow LED is not illuminated.