Abit AV8 3rd eye sub-zero temps?

[NH mr Voodoo]

I'm trying out a Vapochill atm, using a FX53 with the AV8 board. The temperature beeing somewhere in the subzero I can't get a temperature reading. All I see is a C/F symbol. I've tryed different bios's without result. Anyone here using the AV8 with phasechange cooling or anything else providing sub-zero temps, that could throw some light at it maybe?

cheers Peter