Frequently Asked Questions - Honeywell CT3300 Installation And Programming Instructions

Change a program permanently
Follow steps for programming heating schedule or programming cooling schedule.

FREQUENTLY ASKED QUESTIONS

If...
Display does not come on
Temperature display does not go
lower than 45°F (7°C) or higher than
88°F (31°C) during programming.
Display shows flashing "bAt Lo."
Temperature change occurs at wrong
times
Heating does not come on
69-1634—1
• Make sure the batteries are fresh and installed correctly.
• Set System switch to Off. Remove batteries and insert backward for five to
ten seconds to reset thermostat. Replace batteries correctly; display should
come on.
• Temperature limit setting is reached; range is 45°F to 88°F (7°C to 31°C).
• The batteries are low; replace them as soon as possible.
• If "bAt Lo" continues to display after replacing batteries, set System switch
to OFF and insert batteries backward for five to ten seconds. Replace
batteries correctly; display should come on.
• Check program times for period in question. Be sure AM and PM
indications are correct. Make sure current day and time are correct.
Reprogram if necessary.
• Check that the System switch is set to Heat.
• Check the system fuse or circuit breaker and replace or reset if necessary.
• Check for correct wiring and good connections.
• If display is blank or displays "bAt Lo," install fresh batteries.
• Allow time for the furnace to heat up and the fan to come on before
checking for heat at the register.
• If temperature setting is higher than current room temperature and System
On arrow is displayed, thermostat is operating correctly. Contact heating
contractor for assistance.
22
Then...