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Corrections
8.1 Replace faulty valve.
8.2 Replace the board.
8.3 Fix the connections.
8.4 The valve must be fixed or replaced.
8.5 Replace ANL-T2 board.
9.1 Replace board DIG-T2.
9.2 Fix the connections.
9.3 Replace the solenoid. If this does not help,
repair the mechanical part of the valve or
replace the valve.
Possible cause check-up and tests
The problem may be a mechanical failure of the
valve, the valve driver located on ANL-T2
board or the control circuit on board DIG-T2.
8.1 Exhaust valve is stuck.
8.2 check tp8. If the voltage is higher than 4V and
there is control signal to the valve, DIG-T2
board is faulty.
If the voltage is 0VDC the valve is open, the
problem is not the control circuit but some other
element of the system.
8.3 Check the connection between the connector
JP5/4 and the valve.
8.3 Remove the cover protecting the terminals of
the coil and check the voltage when the
solenoid is connected. If the valve is open
despite the coil voltage less than 2V, there is a
mechanical problem.
8.5 If all items checked above conform to
requirements, ANL-T2 board is faulty.
The problem may be caused by the mechanical
part of the valve or the driver located on board
ANL-T2 or the control circuit on board DIG-T2.
9.1 Check TP8. If the voltage is constantly
0VDC, while the valve must be open, then
the problem is on the DIG-T2 board.
9.2 Check the connection between connector
JP5/4 and the valve.
9.3 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, the solenoid or the mechanical
part of the valve are faulty.
Symptom
8. Exhaust valve is always
open.
9. Exhaust valve is always
closed.
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