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400D here. I had a hard time with mine at first aswell. Hope I can help,
Close to the main unit you should have a controler box. Look to see if there are any fault lights lit. If so, use a paperclip (Hang one on something to always have one) to reset the fault. The reset is in the hole about 1-2 inches.
Do you have hot water ? I should have asked that first...
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