1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your White Rodgers 24V Heat Only Thermostat. This device is designed to control heating systems by maintaining a desired temperature within a range of 50 to 90 degrees Fahrenheit (10 to 32 degrees Celsius). Please read these instructions carefully before proceeding with installation or operation to ensure safe and efficient use.
2. Safety Information
Always observe the following safety precautions:
- Electrical Hazard: Disconnect power to the heating system at the main fuse or circuit breaker panel before installing or servicing the thermostat. Failure to do so may result in electrical shock or equipment damage.
- Voltage Compatibility: This thermostat is designed for 24V heating systems only. Do not use it with line voltage (120V or 240V) systems.
- Professional Installation: If you are unfamiliar with electrical wiring, it is recommended to have a qualified electrician or HVAC technician install this thermostat.
- Proper Disposal: Dispose of old thermostats and packaging materials according to local regulations.
3. Installation and Setup
Follow these steps for proper installation:
3.1 Mounting Location
Install the thermostat on an inside wall, approximately 5 feet (1.5 meters) above the floor. Avoid locations:
- Near windows, outside doors, or vents.
- Near heat-generating appliances (e.g., televisions, lamps, refrigerators).
- In direct sunlight or areas with poor air circulation.
3.2 Wiring
Before wiring, ensure power to the heating system is OFF.
- Remove the cover of the old thermostat and note the wire connections. Typically, a heat-only system will have two wires: 'R' (power) and 'W' (heat call).
- Disconnect the wires from the old thermostat.
- Mount the new White Rodgers thermostat base to the wall using the provided screws.
- Connect the 'R' wire to the 'R' terminal and the 'W' wire to the 'W' terminal on the new thermostat. Ensure connections are secure.
- Replace the thermostat cover.
3.3 Initial Power-Up
Restore power to the heating system at the main fuse or circuit breaker panel. The thermostat is now ready for operation.

Figure 1: Front view of the White Rodgers Heat Only Thermostat. The upper slider controls the OFF/ON function, while the lower slider sets the desired temperature, indicated in both Fahrenheit (50-90) and Celsius (10-32).
4. Operating Instructions
The White Rodgers Heat Only Thermostat features simple manual controls.
4.1 Power Control
The upper slider on the thermostat controls the power to the heating system:
- Slide to OFF: Disables the heating system.
- Slide to ON: Enables the heating system to operate based on the set temperature.
4.2 Setting the Temperature
The lower slider on the thermostat is used to set your desired room temperature:
- Ensure the upper slider is set to ON.
- Move the lower slider to the desired temperature setting. The scale indicates temperatures in both Fahrenheit (50-90°F) and Celsius (10-32°C).
- The heating system will activate when the room temperature falls below your set point and will turn off when the room temperature reaches or exceeds your set point.
5. Maintenance
This thermostat requires minimal maintenance.
- Cleaning: Periodically wipe the exterior of the thermostat with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Dust Removal: Gently remove any dust accumulation from the vents or internal components using a soft brush or compressed air. Ensure power is off before cleaning internal components.
- This model does not require battery replacement as it is a mechanical, 24V wired thermostat.
6. Troubleshooting
If you encounter issues with your thermostat, refer to the following table:
| Problem | Possible Cause | Solution |
|---|---|---|
| No heat |
|
|
| Inaccurate temperature reading |
|
|
| Heating system runs continuously |
|
|
7. Specifications
- Brand: White Rodgers (Manufactured by LASCO)
- Model: 24V Heat Only Thermostat
- Voltage: 24 Volts
- Current: 1.2 Amps
- Temperature Range: 50 to 90°F (10 to 32°C)
- Display Type: Manual Slider
- Control Type: Button Control (Slider)
- Backlight: No
- Dimensions: Approximately 20 x 7 x 8.8 inches (Product packaging dimensions, actual unit smaller)
- Item Weight: 6.4 ounces
- UPC: 786710545658
8. Warranty and Support
Specific warranty information for this White Rodgers thermostat is not provided in the product details. For warranty claims or technical support, please refer to the contact information provided with your purchase or visit the official White Rodgers website. Keep your proof of purchase for any warranty-related inquiries.

