Weird Z Axis Limit trip

I can not figure this out. First please understand I am very limited on my knowledge of LinuxCnC. This machines has been running great for 5 years until now. I can not get this arrow off the Z axis which stops me from doing any thing. I only have one limit switch per axis and have "HOME_IGNORE_LIMITS" set in the ini. This has worked for years. If you look at my photo below, the hal config will actually show that the limit switch is working fine. The other two axis have the same behavior with the hal config viewer, except the arrow goes away after the limit is released. Since the Hal config displays the light is going on and off with the clicking of the limit switch, I believe the hardware is working fine. Any one have an idea what to try?

I can add the axis.2.neg-lim-sw-in to the watch tab when I get to work. Are you sure this input is used even though I have "HOME_IGNORE_LIMITS" in the config? I will also send you the Hal file later. I really appreciate you response.

I can home the Z after selecting the ignore limit switch. I am going to work soon to try what you suggested first. Could explain why it will home then throw the error after it completes the home.

OK that is the problem , axis.2.neg-lim-sw-in is not reading the voltage. The IO board seems to be bad for that input. Currently the limit input is jump to all three inputs since I only have one limit switch. Could I just change the Hal input value to the same number as the zhome input which is working?