Went to install a Honeywell RTH221 on my Miller/Amana System-- System was working fine just wanted to upgrade to programmable. Terminals on old therm,
RC/RH (Jumpered),Y C W G. On 221, RC/RH Jumpered, Y,W,G,B. After reading previous posts I taped up the Blue, Turned On the Power, Nothing --No Display.Killed the power, Connected B to B--still nothing! Reinstalled the old therm. Call in for cool but the system won't engage. Any Ideas what I might have done?