Blue Series, Single Pole - red wire problem

I’ve got a single pole light switch in a bedroom that I am replacing with a blue series 2-1. I’ve installed a few previously with no issues. This switch however had a red wire connected with the black into the LOAD terminal on the original switch. When I replicate the wiring on the blue series, I get a color cycle on the switch on a clicking once it has run through the colors. The switch does not turn on or off the light.

What am I doing wrong? Where should the red wire go?

TIA

Do you have a voltmeter? Pictures of the old switch connected? Pictures with the wires pulled out of the box so they can be clearly seen? The color of the wire can be used as a guide, but it really needs to be tested rather than assumed.

I do actually have a voltmeter, but I have never actually used it. I’m embarrassed to say, but I have no idea how to use it on a light switch.

Attached are three photos, the original wiring to the switch and then a look inside the box and the current wiring to the switch. When I replaced the switch, I did I a one-for-one wire replacement. So as I removed one wire from the original switch, I immediately placed it in the new switch, hopefully eliminating any potential confusion between what is what. This is new construction, switch powers a simple overhead light fixture.

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Thank you for your help.

I suspect behind your light fixture you’ll find a black and red wire. They probably wired both to the switch (no idea why) for future fan and light use? In your picture the bundle of black wires with the wire nut is most likely your line. The black and red are the load going to the light above.

You don’t have separate can lights or an outlet turned upside down for a lamp do you?

That was my original thought - perhaps they wired it for a ceiling fan. There are no other lights or outlets connected to the switch. It’s just the overhead.

I did discover that if I put the switch into dimmer mode, it no longer clicks. But not sure if that is a good long term solution or not.

I think line and load are reversed. Swap the line and load. Remove the red and cap with wire nut. Test if it works. If not swap the load black for the red. Test if it works.

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In (on/off) Switch mode, the Relay Click can be disabled – parameter 261