There has been recent talk about the Holman water timer from Bunnings (and I've been singing it's praises), so this may be relevant to some people.
I have found a bug in the Holman CO1905/6 programmable water timer that will not switch off the timer at the correct time.
I have a program set for 10 minutes duration each day, and I have found it works fine under normal operation. But the other day the "Budget" water saver mode was accidentally set to 1% instead of default 100% (the wife was playing with it), and I discovered that the water now switches on but doesn't switch off! Luckily I was home at the time and noticed it didn't switch off.
Watching the display when it does first switch on it displays 000 minutes left (to be expected, as 1% of 10 minutes rounds to zero), but it proceeds to switch the water on anyway and then it stays on and the timer rolls over to 255 minutes and proceeds to count down from there. I have not checked if it then switches off after the 255 minutes, but presumably it would.
So obviously there is a bug in the firmware that does not stop the timer when it first switches on if it set to 0 minutes due to the "budget" feature.
A very nasty bug which can waste a LOT of water (255 minutes worth) when people expect the "budget" feature to *save* them water.
Looks like the programmer has been sloppy and has not done a zero check at the start of the timer loop before it gets to roll over.
I have emailed Holman technical support about this and we'll see what happens.
Dave.