Chronothem III T8601D - Thermostat HONEYWELL - Free user manual and instructions
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| Product Type | Programmable Thermostat |
| Brand | Honeywell |
| Model | Chronothem III T8601D |
| Color | White |
| Dimensions (HxWxD) | 4.6 x 4.6 x 1.2 inches (117 x 117 x 30 mm) |
| Weight | 0.5 lbs (227 g) |
| Power Source | 2 x AA Alkaline batteries (included) or 24 VAC hardwired |
| Display | LCD with backlight |
| Programmable Periods | 4 periods per day (Wake, Leave, Return, Sleep) |
| Programmable Days | 7-day independent programming |
| Temperature Range | 40-90°F (4.5-32°C) |
| Accuracy | ±1°F (±0.5°C) |
| Compatibility | Gas, oil, electric, heat pump (no auxiliary heat) |
| Stages | 1 heat, 1 cool |
| Wiring | 4 or 5 wires (R, C, W, Y, G) |
| Key Features | Simple programming, temporary override, filter reminder, low battery indicator |
| Maintenance | Clean with soft dry cloth; avoid liquids |
| Safety | Low voltage (24 VAC) safe for DIY installation |
| Spare Parts | AA batteries, wall plate, screws |
| Repairability | Replace batteries; no user-serviceable parts inside; professional service for wiring issues |
| Warranty | 1 year limited |
Frequently Asked Questions - Chronothem III T8601D HONEYWELL
How do I set the time and day on my Chronothem III T8601D?
Press the SET button until ‘TIME’ appears. Use the arrow keys to adjust hours and minutes, then press SET again. For day, scroll until correct day is highlighted.
How to program the thermostat for a heating schedule?
Press PROG to enter programming. Select the period (Wake, Leave, Return, Sleep) and set time and temperature using arrows. Repeat for each day group or individual days.
Why is my thermostat not turning on?
Check if batteries are installed correctly and fresh. If hardwired, verify that the circuit breaker is on and the C-wire is connected.
How do I perform a factory reset?
Remove batteries, wait 30 seconds, then reinsert. This resets all settings to default. You may also press and hold PROG and SET together for 5 seconds (if applicable).
What does the 'Filter' reminder mean and how to clear it?
It indicates it’s time to change or clean your HVAC filter. To clear, press SET once (or hold PROG and SET together for 3 seconds, depending on model).
Can I use this thermostat with a heat pump?
Yes, for single-stage heat pumps without auxiliary heat. Ensure wiring matches: O/B for changeover valve, Y for compressor, W for auxiliary (if present) but note this model does not support aux heat.
How do I temporarily override the schedule?
Press the up or down arrow to adjust temperature. The override will remain until the next programmed period. To cancel early, press RUN.
What type of batteries does the T8601D use and how long do they last?
Uses 2 AA alkaline batteries. Battery life is typically about 1 year; low battery indicator appears when replacement is needed.
My thermostat is showing the wrong temperature. How do I calibrate it?
Press and hold PROG and SET simultaneously for 3 seconds until ‘CAL’ appears. Adjust using arrows (range ± 5°F). Press RUN to save.
Can I install this thermostat myself?
Yes, if you have basic wiring knowledge. Follow the included manual. Turn off power to HVAC before installing. Common wire (C) is recommended for hardwired operation.
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