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Asking a simple question: Is that the same as the multi postion valve and how can I check its OK

:? Can anyone help. A couple of nights ago my RCD for the house tripped and I traced it back to the heating and water controls. I have an acl lifestyle controls and a Baxi solo bolier. I have tried replacing the controller but get the same fault. The RCD always trips out after 4 seconds. I have...