There was a thread a few months(?) ago about these. I bought and installed mine then. Came back after the break to find that water had got into the battery compartment, corroded the battery terminal away and as a result the sprinkler had been on for goodness knows how many hours! (it goes on failsafe I believe). Anyone else had this problem?
I have not had that problem, although have not checked that battery compartment recently. But I did have a problem where a lot of my tank water was drained for some unknown reason. The only device hooked up to it was a Holman timer and my garden drip system. I know how much water the drip system uses per hour, so the timer must have been on for a LONG time to drain half the tank, like orders of magnitude longer than the programmed interval. I could find nothing wrong with the programming, but went through and reset each program anyway. Has not happened since.
I heard back from the Holman MD about the firmware problem I had, and he said he'd replace my units when the new model was available. I have not heard back about that.
If you like I can give you the direct email of the Holman MD, if so send me an email off-list.
About 6 weeks ago I installed a Holman 2-dial timer (no LCD display) at a site which uses gravity-fed water from a number of fairly big tanks (about
180kL in total) it waters about 400 plants along part of a driveway - it seems to be working fine so far (none are dead), but I did notice when mucking around with the unit that the ball valve doesn't always open exactly
90 degrees, and I wonder if maybe it doesn't always close exactly, and whether that might lead to some leakage.
It's also reliant on the supply pressure to keep it closed - if the back pressure exceeeds the supply pressure, it will leak water, which leads me to wonder whether at very low supply pressure, it might also leak water. That said, I can't imagine it could be a significant amount.
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