Someone gave me a Vista-20p and a couple wired control panels. No modules. I thought I'd see if I could make it work and make sense of it before I i nvested. I've got it set up on my work bench. It seems that the default i nstaller code is still good and I used the *97 to reset it to defaults. I put 2k resistors across all the zone connections. I can go into installer mode and look at settings. But when I exit the installer mode it says "Fau lt 07". I can't find anything online to explain that?