100
Corrections
25.1 Replace the DIG-T2 board.
25.2 Fix the connections.
25.3 Disassemble the valve and check that
the plunger is free to move and that the
seat is clean and free from debris.
25.4 Replace the coil.
Possible cause check-up and tests
The problem may be caused by the mechanical
part of the valve or the driver located on the
ANL-T2 board or the control circuit on the
DIG-T2 board.
25.1 Check TP10. If the voltage is constantly
<1VDC, while the valve is supposed to
be open, then the problem is on DIG-T2
board.
25.2 Check the connection between
connector JP10 - 6 and the valve for an
open circuit.
25.3 Check the coil input voltage with the
solenoid connected to the valve. If the
voltage is higher than 10VDC and the
valve does not open, then the solenoid
or the mechanical part of the valve are
faulty.
25.4 Take an ohm reading across the
solenoid coil, a 10W coil is 14-15 ohms
and a 12W coil is 9-10 ohms. An
incorrect ohm reading means the coil is
faulty. Check from the coil terminal to
the ground terminal, any reading other
than 0VDC means the coil is faulty.
10. TROUBLESHOOTING (cont.)
10.4 In Process Malfunction (cont.)
Symptom
25. Water valve (15) to
vacuum pump is always
closed.
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