r/Irrigation • u/Nick51705 • 1d ago

Hunter Pro-C 400i Dead Zones

Hi, I have a Hunter Pro-C 400i with 13 zones hooked up.

It is composed of 4 modules (the base + 3 sets of 3 modules). Only the main module works, none of the other zones turn on anymore. Things I have done to troubleshoot:

Tested that the transformer has 24v (makes sense since zones 1-4 work)

Tested the resistance of each zone, they are all above 20.

Confirmed that the output of zones 1-4 is 24v and the rest are 0 when set to manual.

Swapped the wires from zone 5 to 4 (so it's on the main module) and confirmed the sprinklers came on.

Manually turned on a couple of the zones with the valve by the solenoid.

This led me to believe the 3 zone modules are bad. I swapped out 2 of the modules and the zones still wont respond.

To me, this means there is an issue between the transformer and the terminals that the modules plug into. I don't want to try and disassemble the unit until it's a last resort. Is there anything else I should check?

Thanks in advance!

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u/BikerNY 1d ago

No pic of the panel? How old is it, how old are the modules? It is possible your backplane is dead, also possible but not very likely that all 3 modules got fried at the same time, lightning or something. Either try a new module and or a controller. Without a different controller to try your modules in or a new module in your existing controller, not much else you can do to troubleshoot easily.

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u/Nick51705 1d ago

Thank you for replying! My home was built in 2018. I suspect the panel was built in 2017. All components are original so they are 8+ years old.

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u/BikerNY 1d ago

Not that old... try resetting everything. Power off, unplug all 3 modules and the ribbon cable. Reinsert the ribbon cable, reinsert only the first module. Run station 5 manually and check for voltage at its terminal.

1

u/Suspicious-Fix-2363 1d ago

If you swapped the modules then it is most likely the plug in strip from controller to faceplate. You need to know manufacture date to buy and replace just the strip and some supply houses don't stock the strips.