Troubleshooting
10 312787G
Troubleshooting
Color Change Solenoid Valves
NOTE: Refer to the Schematic Diagrams, page 14. If the color change valves are not turning on or off correctly, it
could be caused by one of the following.
Color Change Board Fuse
Cause Solution
1. Air regulator pressure set too
high or too low.
Check air pressure. 80-90 psi (550-630 kPa, 5.5-6.3 bar) is commonly used.
Do not go below 75 psi (0.52 MPa, 5.2 bar) or above 100 psi (0.7 MPa, 7 bar).
2. Air or electrical lines dam-
aged or connections loose.
Visually inspect air and electrical lines for kinks, damage, or loose connec-
tions. Service or replace as needed.
3. Solenoid failure.
Check the applicable solenoid’s LED (see F
IG. 7 and Table 4). If lit, proceed
with the following checks. If not lit, go to Cause 4.
Remove the connector for the applicable solenoid and measure voltage across
the pins on the board. If voltage is between 9-15 Vdc, replace the solenoid.
Manually operate the valves by removing the color change module cover and
pressing and releasing solenoid valve override buttons. F
IG. 6.
Valves should snap open and shut quickly. If the valves actuate slowly, it could
be caused by:
• Air pressure to the valve actuators is too low. See Cause 1.
• Solenoid is clogged. Make sure air supply has 10 micron filter installed.
• Something is restricting the solenoid or tubing. Check for air output from air
line for corresponding solenoid when valve is actuated. Clear restriction.
4. Fluid station control board or
cable failure.
If there is no voltage across the pins on the board or it is less than 9 Vdc,
check LEDs D9 and D10 (see F
IG. 7 and Table 4). If both are lit and function-
ing properly, or other solenoids in the module are working properly, replace the
color change board.
If D9 and D10 are not lit:
• Check if the cable is disconnected or damaged.
• Check the fluid station control board (see the ProMix 2KS Repair-Parts
Manual).
Problem Cause Solution
No power to board. Communication
between color change module and
fluid station is interrupted.
Color change board fuse (F1) is
blown.
Verify condition of fuse. Replace if
necessary. See page 11.
