Customer Assistance - Honeywell RTH6400 Operating Manual

About your new thermostat

Customer assistance

M28415
Model number
xxxxxxx
Date code
xxxxxxx
M28416
RTH6400 Programmable Thermostat
For assistance with this product, please visit
http://DIYthermostats.honeywell.com. Or call
Honeywell Customer Care toll-free at
1-800-468-1502.
To save time, please remove the battery holder
and note your model number and date code
before calling.
Accessories/replacement parts
To order, please call Honeywell Customer Care
toll-free at 1-800-468-1502.
Battery holder .................... Part No. 50007072-001
Cover plate assembly* ...... Part No. 50002883-001
*Use to cover marks left by old thermostats.
9 69-22ES—0