Greetings Daanii. It may be that: 1.-The mall that is at the entrance of the solenoid valve is covered and you are forced to clean it. 2.-If you do not hear any sound in it when selected from the control panel, it is possible that the solenoid valve is damaged and should be replaced. You can test with external power or with the help of a tester to verify if the referred solenoid valve works or not. 3.-That their terminals are dirty and do not let the current pass. 4.-That there is a broken cable of the two that feed it. 5.-That the cable with phase signal does not send the signal from the programming card or board due to damage to an electronic component that could be a triac. Thanks and regards.