Honeywell RTH8500 Series - Troubleshooting; Display is Blank; Cannot Change System Setting to Cool; Fan Not Turning On When Heat is Required

Advanced Installation Guide
69-2219EF—03 26
SETUPWIRINGASSISTANCETROUBLESHOOTING
For assistance with this product, please visit
http://DIYthermostats.honeywell.com
or call Honeywell Customer Care toll-free at
1-800-468-1502.
Customer assistance