102
Corrections
28.1 Replace the DIG-T2 board.
28.2 Fix the connections.
28.3 Disassemble the valve and check that the
plunger is free to move and that the seat is
clean and free from debris.
28.4 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.
28.1 Check TP12. If the voltage is constantly
<1VDC, while the valve is supposed to be
open, then the problem is on DIG-T2
board.
28.2 Check the connection between connector
JP10 - 8 and the valve for an open circuit.
28.3 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.
28.4 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
28. Steam valve (93) is always
closed
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