Hard to say if it needs replacing. I've installed a few TMC 212s over the years but rarely use the interval setting. Unfortunately I don't have one handy to look through to see what might be messed up. If still under warranty you could have it replaced, otherwise use an odd/even schedule and cut back on times by 40% and save the money. Or use the calender and schedule 2 days a week and increase time by 10%, or schedule 3 days a week and decrease by 33%.
This post has been edited 1 times, last edit by "Central Irrigation" (Jun 1st 2014, 5:53pm)