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21 69-0574—2
Troubleshooting
(continued)
1 Not applicable on model used in heating-only system.
2 Not applicable on model used in cooling-only system.
3 If clock is not battery powered, clock may still use batteries for backup.
If this Troubleshooting section has not solved the problem, call your qualified heating service
technician or Honeywell Customer Assistance Center, 1-800-468-1502, Monday-Friday, 7:00 AM to
5:30 PM, Central time, for additional assistance.
Problem Check Action
Clock loses time
(continued).
— batteries may need replacement. Replace with two new AAA alkaline batteries
as shown on page 8. We recommend
Energizer
®
batteries.