1. Introducció
The Honeywell Home CT51N1008 Standard Heat/Cool Manual Thermostat provides a straightforward method for controlling your home's heating and cooling systems. This mercury-free thermostat is designed for ease of use, allowing precise temperature adjustments. It is compatible with central oil heating, electric furnaces, and central electric cooling options.

Figura 1: Frontal view of the Honeywell Home CT51N Thermostat, showing the temperature scale and control switches.
2. Característiques clau
- Mercury-free design.
- Precise temperature control for both heating and cooling systems.
- Standard heat/cool manual operation.
- Requires a 4-wire hookup.
- Compatible with central oil heating, electric furnaces, and central electric cooling.
- Designed for use in single transformer systems only.
- Works with heat pumps without auxiliary heat.
3. Configuració i instal·lació
Important: Before beginning installation, ensure power to the heating and cooling system is turned off at the main fuse or circuit breaker panel to prevent electrical shock or equipment damage.
3.1 Ubicació de muntatge
Install the thermostat on an inside wall, approximately 5 feet (1.5 meters) above the floor. Avoid locations near windows, doors, or heat sources (lamps, sunlight, fireplaces, etc.) that could affect temperature readings.
3.2 Instruccions de cablejat
- Turn off power to the heating/cooling system.
- Remove the old thermostat cover and note the wire connections. Label each wire with the terminal designation (e.g., R, W, Y, G) before disconnecting.
- Munteu la nova placa base del termòstat a la paret amb els cargols proporcionats.
- Connect the wires to the corresponding terminals on the CT51N thermostat. This thermostat typically requires a 4-wire hookup. Refer to your system's specific wiring diagram if unsure.
- Assegureu-vos que totes les connexions siguin segures.
- Attach the thermostat cover to the base plate.
- Restaura l'energia al sistema de calefacció/refrigeració.
This thermostat is designed for single transformer systems only. Do not use with multi-transformer systems.

Figure 2: Dimensions of the Honeywell Home CT51N Thermostat, measuring approximately 2.88 inches wide, 1.38 inches deep, and 4.75 inches high.
4. Instruccions de funcionament
The Honeywell Home CT51N thermostat features simple manual controls for temperature and fan operation.
4.1 System Switch (Heat/Off/Cool)
- Calor: Select this setting for heating operation. The system will turn on when the room temperature falls below your set temperature.
- Apagat: This setting turns off both heating and cooling systems.
- Genial: Select this setting for cooling operation. The system will turn on when the room temperature rises above your set temperature.
4.2 Fan Switch (Auto/On)
- Automàtic: In this setting, the fan runs only when the heating or cooling system is actively operating. This is the most common and energy-efficient setting.
- A: In this setting, the fan runs continuously, regardless of whether the heating or cooling system is actively operating. This can help with air circulation.
4.3 Configuració de la temperatura
Adjust the temperature slider to your desired temperature. The thermostat will maintain the room temperature at this setting based on the selected system mode (Heat or Cool).

Figure 3: The Honeywell Home CT51N Thermostat seamlessly integrated into a contemporary room setting.
5. Manteniment
The Honeywell Home CT51N thermostat requires minimal maintenance.
- Neteja: Netegeu periòdicament l'exterior del termòstat amb un drap suau i sec.amp drap per eliminar la pols i la brutícia. No utilitzeu netejadors abrasius ni dissolvents.
- Sense piles: This thermostat does not require batteries for operation.
6. Solució De Problemes
If you experience issues with your thermostat, refer to the following common troubleshooting steps:
| Problema | Causa possible | Solució |
|---|---|---|
| System does not turn on (heating or cooling) | No power to the system; System switch in 'Off' position; Incorrect wiring | Check circuit breaker/fuse; Ensure system switch is set to 'Heat' or 'Cool'; Verify wiring connections are secure and correct. |
| La lectura de temperatura sembla inexacta | Thermostat located near heat source or draft; Internal sensor obstruction | Relocate thermostat if possible; Ensure no objects are blocking airflow to the thermostat. |
| Fan does not run in 'On' mode | Fan motor issue; Wiring problem | Check fan wiring; Consult an HVAC professional if the fan motor is suspected. |
| System runs continuously or not at all | Faulty thermostat; Wiring issue | Verify wiring; If problem persists, the thermostat may need replacement. |
If these steps do not resolve the issue, contact a qualified HVAC technician for assistance.
7. Especificacions
| Especificació | Detall |
|---|---|
| Marca | Honeywell Home |
| Nom del model | CT51N |
| Tipus de controlador | Control manual |
| Característica especial | Volum baixtage |
| Color | Blanc |
| Usos específics per al producte | Bomba de calor |
| Tipus de control de temperatura | Calefacció i refrigeració |
| Tecnologia de connectivitat | N/A (Manual) |
| Components inclosos | Thermostat and instruction manual |
| Font d'alimentació | System Power (No Batteries Required) |
| Pes de l'article | 3.2 unces |
| Dimensions del producte | 2.88 x 1.38 x 4.75 polzades |
| Material | Plàstic |
| Tipus de visualització | Manual |
| Tipus de muntatge | Muntatge de paret |
| UPC | 085267271196 |
| Número de model de l'article | CT51N1007 |
8. Garantia i Suport
8.1 Informació de la garantia
This Honeywell Home CT51N thermostat comes with a 1-year limited warranty. Please retain your proof of purchase for warranty claims.
8.2 Atenció al client
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please refer to the contact information provided with your product packaging or visit the official Honeywell Home support weblloc.





