Honeywell CM907: Mastering Your Thermostat’s Features
Honeywell created the CM 907 programmable thermostat several years ago. It’s a top-tier weekly programmable thermostat that, unfortunately, has had some issues with its display. In reality, the rest of the program continues to function normally, schedules and settings activate correctly, and the problem only arises when making new programming changes or adjusting the time.
Regarding the product in good condition, programming is done by opening the plastic casing and moving the selector on the right to the appropriate programming function. This is where you start programming the device, which, being weekly, can set the operating temperature for each day of the week. This makes it suitable for families with busy work schedules who need to differentiate between weekdays and holidays for scheduling.
Table of Contents
Programming by Intervals on Honeywell CM907
Regarding programming, there is an interval-based operation that consists of scheduling daily time slots based on the desired temperatures and times. You can therefore modify the time of the slot and the desired temperature. Another positive note is that the thermostat doesn’t just offer the classic three settings (Economy, On, and Comfort); instead, you can freely adjust the operating temperature.
As I mentioned, programming is carried out using the selector on the right, which needs to be moved to the setup position. Once finished, you’ll have to move it back to manual or automatic mode. To program, you only need three buttons: the up and down arrows, then there are left and right arrow buttons to move horizontally through the days, for example, and the OK button to confirm. Another button allows you to copy the current day’s program to the next, and so on. This feature, along with the degree selection, distinguishes this high-end product.
Additional Features
The Honeywell CM907 thermostat offers other interesting functions, which you can learn more about in the instruction manual provided below (downloadable). It’s worth mentioning the Party program (for home celebrations), mid-week vacation mode, and a fully-fledged vacation mode.
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NB: The thermostat is out of production. The Weekly Wired T3C110AEU Thermostat T3 replaces it.
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Below is a neatly formatted and readable table:
Set Date and Time on the Honeywell CM 907 Thermostat
Step 1: Access Date Mode
- Move the slider to the DATE position.
- The screen will display “SET DAY,” and the day will start flashing.
Step 2: Set the Day
- Use the ▲ or ▼ buttons to select the correct day.
- When you find the correct day, press the green OK button to confirm.
Step 3: Set the Month and Year
- After setting the day:
- The month starts flashing with the message “SET MONTH.”
- Use the ▲ or ▼ buttons to select the month, then press the green OK button to confirm.
- Next, the year will start flashing. Repeat the same procedure to set the year.
Important Note
- If you enter an invalid date, the unit will take you back to the start of the date-setting mode.
Step 4: Set the Time
- After setting the date:
- The time starts flashing with the message “SET TIME.”
- Use the ▲ or ▼ buttons to set the correct time (holding them down changes it faster).
- Once set, press the green OK button to save.
Step 5: Confirm the Changes
- After confirming the time:
- The display will show “CHANGES SAVED” and then “DATE COMPLETE.”
Warning
- If you move the slider before “DATE COMPLETE” appears, the changes will not be saved.
You have now correctly set the date and time!
Running the Heating Program on Honeywell CM907
After configuring the date and time, move the slider to the AUTO position to start the heating program. This program is designed for standard comfort needs, but you can customize it as follows.
Preset Heating Program
- The programmable thermostat allows for 6 daily temperature changes from 3:00 AM to 2:50 AM the following day.
- Each temperature level can be set between 5°C and 35°C in increments of 0.5°C.
Example of a Preset Schedule
Monday – Friday
| Period | Time | Temperature |
|---|---|---|
| 1 | 6:30 | 21°C |
| 2 | 8:00 | 18°C |
| 3 | 12:00 | 21°C |
| 4 | 14:00 | 18°C |
| 5 | 18:00 | 21°C |
| 6 | 22:30 | 16°C |
Saturday and Sunday
| Period | Time | Temperature |
|---|---|---|
| 1 | 8:00 | 21°C |
| 2 | 10:00 | 21°C |
| 3 | 12:00 | 21°C |
| 4 | 14:00 | 21°C |
| 5 | 18:00 | 21°C |
| 6 | 23:00 | 16°C |
Modifying the Heating Program
- Access the PROG Mode
Move the slider to PROG. The display will show “SET PROG 1,” and the time for the first period on Monday will start flashing. - Adjust the Period Start Time
- Use the ▲ or ▼ buttons to change the time.
- Press the green OK button to confirm. The display will show “TIME 1 OK?” and then “SET TEMP 1.”
- Set the Temperature of Honeywell CM907
- Use the ▲ or ▼ buttons to adjust the desired temperature for the selected period.
- Press the green OK button to save. The display will show “CHANGES SAVED” and move on to the next period.
- Repeat for All Periods
Repeat the steps for all 6 periods of the day. After period 6, the display will show “DAY COMPLETE.” - Program Other Days
- To copy one day’s schedule to another, use the COPY DAY button.
- To manually configure other days, select them using the DAY button and follow the same steps.
- Save and Exit
Move the slider to AUTO, MAN, or OFF to exit programming mode.
Note: If the programmable thermostat remains idle in PROG mode for more than 10 minutes, it will display “MOVE SLIDER.” Press a button to continue or move the slider to exit.
Access or Modify the Installer Parameters
By following these simple steps, you can access the installer mode and configure the necessary parameters.
Time needed: 10 minutes
- Access the Installer Mode
Move the slider to the OFF position.
Hold down the i button and both the ◄ and ► buttons simultaneously. - Viewing the Parameters
The unit will display the first parameter of the installer group, category 1 (from parameter 1 to 19).
- Editing the Parameters
Press the ▲ or ▼ buttons to change the setting of the selected parameter.
The display will flash to indicate that a change has been made. - Confirming the Change
Press the green OK button to save the change.
The display will stop flashing, indicating the change has been confirmed. - Move to the Next Parameter
Use the ► button to scroll to the next parameter within the same category.
- Change Category
Press the ► button to switch from category 1 to category 2 (parameters 0 to 5).
- Exit Installer Mode
Move the slider to the AUTO or MAN position to exit the installer mode.
You can now easily configure the parameters according to your needs.
Category 1 Parameters – Thermostat Parameters
| Parameter | Parameter No. | Description | Default Value | Modification Range |
|---|---|---|---|---|
| 12 / 24 Hour Display | 1:CL | 24-hour display format | 24 | 12 / 24 |
| Reset the Time / Temperature Program | 2:rP | Sets the time / temperature profile to default values | 1 | 0 / 1 |
| Automatic Summer / Winter Time Change | 3:tC | Automatic daylight savings change enabled | 1 | 0 / 1 |
| LCD Backlight | 5:bL | Backlight enabled | 1 | 0 / 1 |
| Upper Temperature Limit | 6:uL | Upper temperature limit: 35°C | 35 | 21 .. 34 (0.5°C increments) |
| Lower Temperature Limit | 7:LL | Lower temperature limit: 5°C | 5 | 6 .. 21 (0.5°C increments) |
| Optimization | 8:OP | Optimization enabled | 0 | 0 / 1 |
| Telephone Interface | 9:tS | Manual change via telephone disabled | 0 | 1 |
| Second Sensor | 10:SS | Second sensor disabled | 0 | 1 (External Sensor) / 2 (Remote Sensor) |
| Temperature Offset | 12:tO | No temperature offset | 0.0 | -3 .. +3 (0.1°C increments) |
| Proportional Band Width | 13:Pb | Proportional band of 1.5 degrees | 1.5 | 1.6 .. 3.0 (0.1°C increments) |
| Reset Parameters to Default Values | 19:FS | All parameters set to default values | 1 | 0 |
Boiler Control Parameters
| Parameter | Parameter No. | Description | Default Value | Modification Range |
|---|---|---|---|---|
| Minimum Boiler Runtime | 1:Ot | Minimum runtime of 1 minute | 1 | 2, 3, 4, 5 minutes |
| Cycle Frequency | 2:Cr | 6 cycles per hour | 6 | 3, 9, 12 cycles |
| Electric Heating | 3:EH | Resistive loads <3 A | 0 | 3 – 8 A |
| Heating / Cooling Change | 4:HC | Disabled | 0 | 1 |
| Use of the Pump | 5:PE | Use of the pump disabled | 0 | 1 |
Frequently Asked Questions about the Honeywell CM 907 Thermostat
The most frequent issue concerns the display, which sometimes makes programming difficult while keeping the schedules active.
Move the slider to “DATA,” use the ▲ and ▼ buttons to change the day, month, and year, then confirm with the green button.
Advanced weekly programming, customized time intervals, Party and Vacation modes.
Yes, with the “Copy Day” button you can duplicate one day’s schedule to others.
You can set temperatures between 5°C and 35°C, in 0.5°C increments.
Move the slider to “OFF” and hold down the i button along with the ◄ and ► buttons.
No, but the Weekly Wired T3C110AEU Model is a modern alternative.
Materials
- Honeywell CM907 Thermostat Instruction Manual PDF in Italian
- CM907 Instructions Excerpt PDF in Italian
- Declaration of Conformity
