CT3697 - Thermostat HONEYWELL - Free user manual and instructions
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| Product Type | Thermostat |
| Brand | Honeywell |
| Model | CT3697 |
| Dimensions | 4.5 x 3.5 x 1.2 inches |
| Weight | 0.4 lbs |
| Power Source | 2 AA alkaline batteries (optional hardwired 24VAC) |
| Display Type | Digital LCD with backlight |
| Temperature Range | 40°F to 90°F (4.5°C to 32°C) |
| Programmable | Yes, 7-day programmable with 4 periods per day |
| Compatibility | Most single-stage heating/cooling systems, heat pumps (no auxiliary) |
| Wire Configuration | 4-wire (R, W, Y, G) or 5-wire (add C wire) |
| Special Functions | Filter reminder, keypad lockout, temporary override |
| Accuracy | ±1°F |
| Warranty | 1 year limited |
| Maintenance | Clean with dry cloth; replace batteries annually |
| Safety | UL and CSA listed |
| User Manual | Available in PDF on Honeywell website |
Frequently Asked Questions - CT3697 HONEYWELL
How do I set the current time and day on the CT3697 thermostat?
Press the SET button. Use the + or - buttons to adjust hours, then press SET again to adjust minutes. Repeat for the day of the week. Finally press RUN to save.
What type of batteries does the CT3697 use?
The thermostat requires two AA alkaline batteries. They are not included. Replace them once a year or when the low battery indicator appears.
Can I use the CT3697 with a heat pump system?
Yes, the CT3697 is compatible with single-stage heat pumps without auxiliary heat. For multi-stage or auxiliary heat, consider a different model.
How do I set a temperature schedule?
Press PROG to enter programming. Choose the day(s) (e.g., weekday). Use + and - to set the time and temperature for each period (Wake, Leave, Return, Sleep). Press RUN to activate.
Why does my thermostat display 'E1' or 'E2' error?
Error codes usually indicate wiring or sensor issues. Check that wires are firmly connected. E1 often means shorted sensor; E2 means open sensor. Consult the manual for troubleshooting.
How do I clean the thermostat?
Use a soft, dry cloth to wipe the exterior. Do not use water, solvents, or abrasive cleaners. Avoid spraying liquids directly onto the unit.
Can I lock the thermostat to prevent unauthorized changes?
Yes, the CT3697 has a keypad lockout feature. Press and hold both PROG and SET buttons for 3 seconds to lock or unlock the keypad.
What is the temperature accuracy of the CT3697?
The thermostat is accurate to within ±1°F (±0.5°C) under normal conditions.
How do I reset the filter reminder?
Press SET until the filter icon flashes. Press + to reset the timer. The icon will disappear if the reminder was set.
Is a 'C' wire required for the CT3697?
No, a C wire (common wire) is not required for basic operation. However, if you have one, connect it to the C terminal. Without C wire, the thermostat runs on batteries.
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