Your new Honeywell Chronotherm III
Fuel Saver Thermostat is a precision
instrument that's quality-built to give
you many years of satisfactory
service. Each day of the week can be
programmed independently so that,
regardless of your schedule, you'll
save fuel while automatically
maintaining the standard of comfort
you require.
This User's Guide will show you how
to get the most benefit from your new
thermostat.
Programming Your Thermostat ............... l-1 8
the program times and temperatures
Set
the
remaining
for
days ..................... 14
Set the system and fan switches
Operating Your Thermostat ................. 19-26
Maintaining Your Thermostat ............... 27-30
Glossary ..................................... 31-32
Your Daily Program ......................... 33-34
Model Identification Guide .................. 35-36
Troubleshooting Guide ...................... 37-38
Index ......................................... 41-42
Warranty ........................................ .43
Need help?
Do you have a question about the Chronotherm III and is the answer not in the manual?
Questions and answers
Are batteries only for backup? we only use the thermostat for manual adjustment of heat/cool and temperature.
Yes, the batteries in the Honeywell Chronotherm III thermostat are primarily used as backup to hold programming and keep the display on during power outages.
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my thermostat is displaying AC IT WILL NOT operate in air-conditioning or heat mode.please send suggestion. Thanks
If the Honeywell Chronotherm III thermostat displays "COOL ON" or "HEAT ON" (or SYSTEM light is on) but the system does not operate, follow these troubleshooting steps:
1. Check Current Temperature Setting: Press PRESENT SETTING to see if the temperature is set appropriately.
2. Adjust Settings if Needed: Change the time or temperature setting if desired.
3. Allow Time for Operation: If the display says HEAT ON but no heat is coming from the registers, wait for the heating equipment to warm up.
4. Check Batteries: If the display flashes REPL BAT or goes blank when power is off, install fresh AAA alkaline batteries.
5. Contact Contractor: If the display says COOL ON or SYSTEM light is on, but the system still does not cool or heat, contact your heating and air conditioning contractor.
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How to switch Honeywell Chronotherm III thermostat from calcium to Fahrenheit?