Flash not going off

Ok so I'm completely new to underwater photography so this might be/ I hope it is something I'm doing wrong.

I have a sony a7rii with ikelite housing, and i just purchased a used inon z240. I purchased the cable from ikelite and when I connect it all the flash doesn't go off I have the flash turned on and flash on the camera all set to manually. The only flash that comes on is the modeling light. Is there a setting I have to turn on?

If you are using manual flash you need to set the dial to manual and then decide what to do with the advanced cancel circuit. You are connecting by cable - correct? As the A7 doesn't have a built in flash?

I believe that when connected by sync cable the Z-240 is manual only and that the advanced cancel circuit button must be pushed in.

Here's a trouble shooting guide which may help: https://reefphoto.com/blogs/lighting/troubleshooting-strobes-with-electrical-sync

and a quick start guide: https://aquaventurescuba.com/inon-strobe-quick-startset-up-guide/

If you are using manual flash you need to set the dial to manual and then decide what to do with the advanced cancel circuit. You are connecting by cable - correct? As the A7 doesn't have a built in flash?

 

I believe that when connected by sync cable the Z-240 is manual only and that the advanced cancel circuit button must be pushed in.

 

Here's a trouble shooting guide which may help: https://reefphoto.com/blogs/lighting/troubleshooting-strobes-with-electrical-sync

 

and a quick start guide: https://aquaventurescuba.com/inon-strobe-quick-startset-up-guide/

Thanks for the info was a big help, was able to determine that the flash works. Must be a bad/loose connection somewhere. Went out yesterday for my first dive with it. Got the flash to work on the boat but once in the water couldn't get it to trigger. Going to look at all the cables and figure out where the problem is.

Assume you got the correct cable, they have one specifically for INON and similar flashes Single Sync Cord # 45281 or Dual Sync Cord # 45282. The trouble shooting guide does not have anything specific for Sony so you may need to call Ikelite to see if they can help as well.