1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Sunster 2409PW Car Heater LCD Switch. This advanced control unit offers convenient one-click access to various heating modes and features WIFI and Bluetooth connectivity for seamless app control. It is designed for universal compatibility with both 12V and 24V vehicle heating systems.
2. Product Overview
The Sunster 2409PW LCD Switch serves as the primary interface for your car heater, providing intuitive control and real-time status display. Its robust design ensures long service life and ease of use.
2.1 Key Features
- One-click Access: Directly switch between Ventilation, Gear (Max), and Temperature modes.
- WIFI & Bluetooth Control: Remotely manage your heater via a dedicated smartphone application.
- Universal Voltage: Compatible with 12V and 24V vehicle electrical systems.
- Automatic Start & Stop: Maintains constant temperature efficiently.
- Adaptive Plateau: Automatically adjusts parameters based on altitude.
- Multi-language Support: English, Russian, Chinese voice options.
- Timer Switch: Program heating schedules (one week / two sets per day).
- Fault Display: Indicates up to 8 different fault codes for easier troubleshooting.
2.2 Package Contents
Depending on your purchase, the package may include:
- 1 x 2409PW LCD Monitor
- 1 x Motherboard (if "WIFI 2409PW + Motherboard" set is selected)

Figure 1: Front view of the Sunster 2409PW LCD Switch.

Figure 2: Rear view of the Sunster 2409PW LCD Switch.
3. Specifications
| Feature | Description |
|---|---|
| Brand Name | Sunster |
| Model | 2409PW |
| Item Type | Heating & Fans (Control Switch) |
| Voltage | 12V-24V Universal |
| Material | Plastic |
| Remote Control | Bluetooth & WIFI (No restrictions on distance for Wi-Fi) |
| Operation Method | 6 Buttons |
| Automatic Start & Stop | Yes (for constant temperature) |
| Ventilation Function | Yes |
| Adaptive Plateau | Yes (Displays altitude, automatic adjustment) |
| Language Selection (Voice) | English, Russian, Chinese |
| Timer Switch | Yes (one week / 2 sets per day) |
| Temperature Compensation | Yes |
| Temperature Scale Switch | Fahrenheit/Celsius (Default 'F') |
| Fault Display | 8 Fault Codes |
| Package Dimensions (L x W x H) | 12 cm x 12 cm x 12 cm |
| Package Weight | 0.2 kg |

Figure 3: Summary of 2409PW LCD Switch features.
4. Setup
Before proceeding with the setup, ensure your vehicle's heating system is compatible with a 12V or 24V control unit. Professional installation is recommended for electrical components.
4.1 Physical Installation
- Mounting the LCD Switch: Choose a suitable, easily accessible location within your vehicle. Use appropriate fasteners to secure the switch, ensuring it is stable and does not obstruct driving. Refer to Figure 2 for mounting points on the rear of the switch.
- Connecting to the Heater Unit: Connect the provided cable from the LCD Switch to the corresponding port on your main car heater unit. Ensure the connection is secure and correctly oriented to prevent damage.
- Power Connection: Verify that the heater unit and the LCD switch receive the correct 12V or 24V power supply from your vehicle's electrical system. Incorrect voltage can damage the device.
4.2 App Pairing (WIFI & Bluetooth)
- Download the App: Search for the official "Sunster Car Heater" app on your smartphone's app store (iOS or Android).
- Enable Bluetooth/WIFI: Ensure Bluetooth and WIFI are enabled on your smartphone.
- Pairing Process:
- Open the app and follow the on-screen instructions to add a new device.
- The app will search for available 2409PW devices via Bluetooth or WIFI.
- Select your device from the list and complete the pairing process. You may be prompted to enter a default password (check the app or main heater manual for this).
- Network Configuration (WIFI): For WIFI control, you may need to connect the switch to your vehicle's or a local WIFI network through the app settings. This allows for remote control from anywhere with internet access.

Figure 4: Overview of WIFI Remote Control Switch features.
5. Operating Instructions
The 2409PW LCD Switch offers both manual control via its buttons and remote control via the smartphone app.
5.1 LCD Switch Operation

Figure 5: LCD Monitor and Control Buttons.
- Power ON/OFF: Press the ON/OFF button (labeled 'OFF' in Figure 5) to turn the heater on or off.
- Mode Selection (One-click Access):
- Press the Ventilation Mode button to activate the ventilation system.
- Press the Gear Mode (Max Mode) button to switch between different heating power levels or activate maximum heating.
- Press the Temperature Mode button to adjust the target temperature.
- Adjusting Settings (UP/DOWN): Use the UP and DOWN buttons to increase or decrease values such as temperature, gear level, or navigate menu options.
- Automatic Start & Stop: When in Temperature Mode, the system can automatically start and stop the heater to maintain the set constant temperature.
- Timer Switch: Access the timer settings through the menu (using UP/DOWN buttons) to program daily or weekly heating schedules.
- Language Selection: Navigate to the language settings in the menu to choose between English, Russian, or Chinese voice prompts.
- Temperature Scale: Switch between Fahrenheit ('F') and Celsius ('C') in the settings menu. The default is Fahrenheit.
5.2 App Control (WIFI & Bluetooth)
The smartphone app provides comprehensive control over your heater from a distance.

Figure 6: Wifi Smart App Control Interface.
- Remote ON/OFF: Start or stop the heater from your smartphone.
- Temperature Adjustment: Set your desired temperature remotely.
- Mode Switching: Change between heating, ventilation, or max power modes.
- Timing Function: Schedule heating times and durations.
- Language Settings: Adjust the device's language settings.
- Gear Settings: Control the heating power level.
- Blow Mode: Activate the fan-only mode for ventilation.
- Status Monitoring: View real-time status, including current temperature, altitude, and any active fault codes.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your 2409PW LCD Switch.
- Cleaning: Gently wipe the LCD screen and buttons with a soft, dry cloth. Avoid using abrasive cleaners or solvents that could damage the plastic or screen.
- Connection Check: Periodically inspect all cable connections to ensure they are secure and free from corrosion or damage.
- Software Updates: Check the smartphone app regularly for any available firmware updates for the 2409PW switch to ensure you have the latest features and bug fixes.
- Environmental Protection: While designed for vehicle use, avoid exposing the switch to extreme temperatures, direct sunlight for prolonged periods, or excessive moisture.
7. Troubleshooting
If you encounter issues with your 2409PW LCD Switch, refer to the following common troubleshooting steps.
7.1 Fault Codes
The LCD display can show up to 8 different fault codes. If a fault code appears, consult your main car heater unit's manual for specific interpretations and recommended actions. Common issues often relate to power supply, sensor malfunctions, or heater unit errors.
7.2 General Troubleshooting
- Switch Not Responding:
- Check power connections to both the switch and the main heater unit.
- Ensure the vehicle's battery has sufficient charge.
- Try restarting the vehicle and the heater system.
- App Connectivity Issues:
- Ensure Bluetooth and WIFI are enabled on your smartphone.
- Verify the switch is within range for Bluetooth, or connected to a stable WIFI network for remote access.
- Restart the app and try re-pairing the device.
- Check if there are any app updates available.
- Inaccurate Temperature Readings:
- Ensure the temperature sensor (if external) is clean and not obstructed.
- Check for any temperature compensation settings that might be incorrectly configured.
If problems persist, contact customer support for further assistance.
8. Warranty and Support
Your Sunster 2409PW Car Heater LCD Switch comes with a standard manufacturer's warranty. Please retain your proof of purchase for any warranty claims.
For technical support, troubleshooting assistance, or warranty inquiries, please contact the seller or Sunster customer service through the platform where the product was purchased. Provide your product model number (2409PW) and a detailed description of the issue to expedite support.





