My guess, and it is just a guess, is that the IR filter is stuck. If you see a clear red light, on the front of the camera, when the camera is meant to be recording at night, then the IR illuminator is working. To the human eye this doesn’t seem to be a very bright red light, we can barely perceive one end of its frequency spectrum, and nothing from its peak, or the other end of that spectrum, but it’s very bright in IR at the centre of this spectrum. To your camera phone it should appear brighter, but still not too bright, as those sensors aren’t as sensitive to IR as the blink sensors.
The purpose of the IR filter is to provide good colour reproduction during the day. During daytime there is lots of infrared present, and with the camera having a sensor that is sensitive to it, your colour reproduction is completely out of whack without the filter being present.
If we could see infrared in the same way as the sensor, there would be no need for this filter, because the view would look the same as we see, but we aren’t sensitive to it, so we are, in a way, filtering it out, with our normal vision. In order for the camera view to be representative of what we see, all the IR has to be filtered out, and as a result, for daytime shots the infrared filter is in front of the lens.
For night time, when we want to make use of the IR light on the camera, the filter has to be drawn back, so that the sensor can be exposed to the reflected IR light, illuminating the image. If it is stuck in place, it will filter out all infrared and the illuminator will be a complete waste of time, on high or low.
Set it up in a dark room. Walk in front of the camera to initiate a recording, and you should hear a distinct click. If you don’t hear this click, then the IR filter is not being moved away, and this is your explanation.
If you hear a muffled click, or repeated clicks, then this too would explain it.
Also, this filter sometimes fails to move if your batteries are in poor condition, so try a brand new set of energizer lithium ultra, even though you are probably using the new ones that came with it. You never know, maybe you have a bad set.
So you know what the click should sound like, and how bright the scene should be, I will make a recording with my phone, of my camera swinging into action, being as it is dark now. Give me ten minutes.