What should I do if I need technical support for my TH8320U?
For assistance with your TH8320U thermostat, you can visit http://customer.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502. Both resources are available to help with product questions and troubleshooting.
From the official Honeywell T8320U Programmable Thermostat manual, page 1
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