Dahua thermal image showing grey screen with flashing blue and red circles

[s300bee]

Hi
I have a new to me Dahua Thermal Hybrid Speed Done Camera TPC-SD2221. The thermal camera is displaying a blank grey screen with flashing blue and red circles moving around the screen. I really don't know anything about these cameras, any ideas?! Thanks

 

[Mark_M]

Hello @s300bee ,

Can you share a video or a screenshot with the issue?

From your vague description, it may be the thermal camera covered over and you're just seeing the red/blue circles to indicate the hottest and coolest parts of the image.
But hard to know without a photo.