How do you reset a FC error code on a Honeywell vista 15/20 P? Everything says call the alarm company and that not possible. I have the master code but need to know how and what to enter exactly to clear or reset the star 40 Thur 44 phone data.

Try a hard reset

How to Reset a Honeywell Alarm System | eHow (http://www.ehow.com/how_7157319_reset-honeywell-alarm-system.html)

This may also be helpful

http://securityalarmcorp.com/wp-content/uploads/2012/10/Large-Print-Honeywell-VISTA-15-20PCustomer-Instructions.pdf

Or these videos,

reset alarm history on a honeywell security system - Bing video (http://www.bing.com/videos/search?q=reset+alarm+history+on+a+honeywell+securi ty+system&qpvt=reset+alarm+history+on+a+honeywell+security+s ysrem&FORM=VDRE) AND https://www.youtube.com/watch?v=395KANmGVCE