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I have the trigger on my camera and I have replaced all batteries. receiver attached to flash (a Neewer NW561) for off-camera use. Test on flash gun works fine. Test on trigger shows red but no test flash Press shutter and nothing happens. All other modes are where they should be no slaves etc. Camera in manual exposure preview button set correctly. Flash set to M too. It was working fine and now???? Any ideas please.

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    \$\begingroup\$ Which triggers are you using? These? \$\endgroup\$
    – inkista
    Commented Feb 8, 2021 at 1:17
  • \$\begingroup\$ What camera are you using as well? I know some Nikons have issues with third party flashguns (I've got a Nikon Z5 and it won't work with TTL and won't fire at all if I have silent photography turned on) \$\endgroup\$
    – HourglassPhoto
    Commented Feb 9, 2021 at 17:41

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Make sure the trigger is fully seated in the hot shoe because this is the most common cause of flash equipment suddenly not working.

A second common cause of flash not firing is setting the camera shutter speed above the camera’s maximum sync speed. It is not uncommon for cameras to disable flash firing electronics when the shutter speed is too high.

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  • \$\begingroup\$ Ive done that and cleaned the contacts. It seems as though it has just stopped working. Think it might go back! \$\endgroup\$
    – Sandra Walding
    Commented Feb 7, 2021 at 17:27
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    \$\begingroup\$ @SandraWalding what is the shutter speed setting on the camera and what is the top sync speed of the camera \$\endgroup\$
    – Bob Macaroni McStevens
    Commented Feb 7, 2021 at 18:36
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That the flash works on the camera hotshoe means you've eliminated the camera hotshoe and the flash foot as potential issues. And that the Test button isn't firing the flash eliminates camera flash modes as an issue.

Assuming your flash triggers are the rebranded Godox CT-16 manual triggers that Neewer tends to sell with their flashes :) Here are some things you can check in general when it comes to triggering misfires:

  • Are the batteries in everything in good health and fully charged? (Low charge can be a culprit, and a battery in bad health may look like it's fully charged when it's actually not capable of holding full charge).
  • Is the transmitter seated fully forward and locked down in the camera hotshoe? If the sync pin on the transmitter isn't making contact with the sync contact on the hotshoe, the signal won't be communicated.
  • Similarly, is the flash seated all the way forward and securely locked down into the hotshoe of the receiver?
  • Are the transmitter and receiver units set to use the same channel? (The dip switches on the receiver are exposed, so could be knocked off.
  • Is there nearby radio interference? Have you tried switching channels or moving to a different location farther away from, say, wi-fi routers or other 2.4 GHz radio gear?
  • Is the flash set as if it were to be used on-camera? (I.e., out of any wireless slave modes?). Using a built-in optical sensor or radio receiver as the triggering method may disable the flash's foot.
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