What do you mean “backwards” ? Install your timer onto the outdoor faucet and turn it on, either manually by pressing the button on the timer itself for 5 seconds or turning it on thru your phone app using the traditional timer method. See if you get water to come out of the timer without the hose attached. Since you say you have a hose reel attached after the timer, then maybe your hose is kinked in the reel. Have you resolved your issue ?