I have Orbit irrigation timer 6-zone system. The timer stopped working and showed "off power". The fuse was blowing off.
After little bit of detective works and wasted few of the fuses, I had found out that the problem is zone 3. I also used multimeter measure zone 3 is around 5 ohm. The rest of the other zones are fine (~35 ohm). Apparently, the solenoid on zone 3 is bad.
Went to Lowes bought and replaced with new solenoid. Fused blowing up right after switched to zone 3. Replaced with another solenoid. Same thing, fuse blow off.
Reading over the net, all saying was if the ohm is low then the cause from solenoid. If crazy high out of range (20-60), the cause from the short wire.
For now, I use the system with no setting on zone 3.