Helix 9 temperature won't read

I recently bought a Helix 9 Gen 3 off TFF. Everything seems to work fine on it except the temperature doesn't read right. reads about 154.

Is there some setting adjustment that I can make? I can't seem to find it.

Thanks,
cliff shot

Just have to ask and make sure but are you reading the actual temp or heading especially in chart view?

It is the actual temperature. Not the heading in chart view.

does it have a t, c or f just to the right of the number?

F