a. On-off valve defective
1. Check movement of actuator on-off valve (SV).
2. Manually open the valve or see if it opens in maintenance mode from the HMI.
3. Replace if actuator not working
b. Solenoid Valve defective on SV
1. Check if valve is defective by activating manual override.
2. Check electrical signal.
3. Check control box, according to electrical diagram.
4. Replace defective fuse, electrical component or wire.
5. If electrical signal is ok, then replace solenoid.