Good afternoon all, I have been rebuilding this machine (pictured) from ground up replacing necessities as i go. The one and only problem i have come across so far (pretty major) is that once plumbed and wired up when i run any water through the group using the buttons it instead shoots water out the valves under the group head. What am i doing / have i done wrong? Wires around the wrong way could cause this? It is on both group heads. Any advice (apart from why did you bother..) will be greatly appreciated

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