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I had an OSpi zone which wouldn’t power up. I moved the valve wire to another zone, turned it on, and heard a brief buzz followed by a pop. Whoops, now I have 2 fried zones.
I then verified that the sprinkler valve wire has a short circuit. (should have done that first :/) Looking at the schematic, I don’t see fuses on the sprinkler zones. If you have experience with this, which component(s) likely blew? Any testing/repair advice?
Which hardware version of OSPi do you have? The current version has a fuse in line on the COM (common) path. However, if you have a shorted solenoid or wiring, often the fuse is too slow to react. Because there is no current sensing capability on OSPi currently, it can’t trigger software-based overcurrent protection like OpenSprinkler v3 does. If you want you can add a per-zone fast-acting fuse, 1A is sufficient.
We highly recommend performing a solenoid resistance testing before you connect your valves to the controller, to rule out shorting issues.
The damaged triacs are generally very easy to replace: they are through-hole components with part number MAC97. If you have soldering tools you can replace it yourself.
Thanks for the reply! I’ve got OSPi v1.51. Upon closer look, it’s clear what parts blew. I think this is an acceptable replacement. https://mou.sr/49Y9NQX Does that look right to you? Thanks!
Ah, looks like you have the older version (v1.51) which still used SMD triacs. They are still relatively easy to replace: if you have a hot air gun, it’s straightforward to heat up the triac and remove it; if not, use a diagonal cutter to **very carefully** cut the three small legs, then use a soldering iron to remove the three cut legs and finally the body (via the big pin at the top). Then you can hand-solder a new part.
The SMD part is Z0103MN, which should be available on both digikey and mouser. If you have trouble finding the part or replacing it on your own, you can send a support ticket at:
support.opensprinkler.com
and arrange to ship it back to us so we can replace it for you at a nominal cost.
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