My hot water timer is making a noise continously (at least every time I check it). Almost every second. Is this something to be woried about, or does it need replaced?
Most all water heater timers have a very small motor turning continously, as inside a watch. If it is a continous hum, it is just the motor running. As you are aware the dial turns. This is accomplished by the small motor turning inside.
If it worked before you worked on it. You did something wrong.