Troubleshooting
5
The AL250-V2 Reverse Osmosis Controller is designed for ease of maintenance and minimum service.
Since the highest quality of electronic semiconductor components are used in this design, it is not likely
that circuit malfunctions or failures will occur.
It is our experience that field failures which most frequently occur are:
Improper or broken wiring connections
Incorrect wiring of magnetic starter
Improper grounding
Cable run is too long
Water in connectors
Dirty cell electrodes
Defective conductivity/temperature probes
The following table lists the problems commonly encountered when using the AL250-V2.
Problem
Probable Cause
Tests and Corrective Action
Nothing appears on the display and
backlight is not illuminated.
No power.
Ensure that 115, 208 or 230 VAC is
connected to the proper terminals on the
terminal strip. Check for 24 - 30VAC on
terminals #35 and #37. Voltage between
#35 and ground or #37 and ground will be
½ of the total secondary voltage. Check
for loose wires on circuit board.
The RO will not start when the start
button is pressed.
“SYSTEM OFF” is displayed on line 4 of
the Main Menu.
AL250-V2 is in Standby Mode.
The AL250-V2 will not start the RO in the
Standby mode. Review line 2 of the Main
Menu display for a system MODE
message.
AL250-V2 is in pretreatment interlock.
If the pretreatment interlock input is OFF
then the AL250-V2 will not start. The
pretreatment interlock LED will be ON.
