Suddenly started reporting 0 gpm flow on random zones


#1

I installed a flow meter at the end of last year and calibrated. For 5 months it seems to be working perfectly, no warnings ever. Suddenly last week I started getting warnings of 0.0 gpm flow on random zones (so far, 5 of 12 active zones). An average of roughly one of those warnings per watering cycle. When I test the zones manually they seem to work fine, and the valves are in different areas so a wiring issue seems unlikely.

Battery reports Good and signal strength Excellent. I’ll try bumping the pressure time from 2 minutes to 3 to see if that helps, but 2 minutes seems like long enough to pressurize from what I’ve seen, and 0.0 gpm seems odd. I’m not understanding why the sudden change.


#2

This symptom continues and has even extended to more zones. Increasing the pressure time did not make a difference.

I’m now up to 10 zones (of 12 total) that have given the low flow alert, always 0.0 gpm. It seems to give me a few of these on every watering day now. I can’t be certain that the zones worked correctly, as it is running overnight, but when I run tests during the day they always seem to work as expected.

Full disclosure: I have had a problem with 2 zones where the valve did not open. But I’ve tracked that down to a specific bad electrical connection that only impacted those 2 zones. I “think” those are now resolved.

Any suggestions, or similar issues out there? It’s odd that this started so suddenly, and so widely/randomly. Any chance the 2 bad zones could lead to messages being issued for other zones?


#3

What is the ‘normal’ gpm of the zones that are not working?


#4

Do you have a master valve or a pump relay by any chance? What you are describing sounds like the issue is effecting a common denominator. I would also pay particular attention to your common line. Often connection may degrade with many wires sharing the same wire-nut.


#5

Thanks MeterManSays and Gene. Normal gpm ranges from 7.6 to 20 gpm (10 different zones, so everything in between, with most in the 8-14 range).

I don’t think there is a master vale or pump relay, but the common line is a good point. I believe the wire causing the known issue was a common line leading to the last two zones in the system. I’m not sure how this could affect any other zones, but it is a possible common denominator.

I’ll watch for further errors now that the two bad zones are (probably) resolved. Perhaps that was somehow the cause of all the warnings.