When it comes to Webasto heating systems, smart control means better comfort, energy savings, and ease of use. The Webasto SmarTemp 3.0 Bluetooth (BT) timer is more than an upgrade - it’s the future of programmable heat.

When it comes to Webasto heating systems, smart control means better comfort, energy savings, and ease of use. The Webasto SmarTemp 3.0 Bluetooth (BT) timer is more than an upgrade - it’s the future of programmable heat. It lets you schedule start times, monitor heater diagnostics, and manage comfort right from its touchscreen or the Webasto app. Whether you're outfitting a van, truck, crane, or heavy machinery, this controller brings modern convenience to your Webasto system.

The Webasto SmartTemp 3.0 BT is a digital controller that works with Webasto diesel air and water heaters. It’s compatible with the Air Top 2000 STC, EVO 40 and 55, Thermo Top Evo, Thermo Pro 50, Pro 90, and Pro 150 models. Its interface features a backlit screen, intuitive menus, and Bluetooth connectivity. This lets you set heating times, change temperature settings, and view error codes - either directly on the controller or through your mobile device via the Webasto app.

• Set daily heater schedules
• Heater diagnostics capability
• Adjust temperature precisely - not just on/off
• Lock settings to prevent unwanted changes (great for fleet use)
• Power-saving modes for off-grid systems
• Bluetooth mobile app control
  

A smart timer like the SmarTemp 3.0 BT saves energy, simplifies heating routines, and improves reliability. In mobile, remote, or professional applications, being able to automate heat cycles reduces manual work and prevents energy waste. Whether you're driving a truck, managing a fleet, heating equipment overnight, or living off-grid, a programmable controller gives you dependable, consistent performance.

The SmarTemp 3.0 BT requires the correct adapter harness based on your heater model and current controller type. To upgrade your current controller to the SmartTemp 3.0 BT model, you will need the following adapter:

Some setups may require heater firmware updates or dealer-level configuration. Always confirm your heater model and existing controller before purchasing.

One of the most valuable features of the Webasto SmarTemp 3.0 Bluetooth Timer is its built-in diagnostic system. Instead of needing external tools right away, users can get instant feedback directly on the controller screen.

When a heater issue occurs, the SmarTemp 3.0 BT displays a fault code that identifies the problem. It also stores up to five recent errors, which can be reviewed at any time by accessing the Error Code menu. This makes it easier to understand intermittent issues or recurring faults.

If the heater enters a lockout condition, the controller will display a “Clear Lock Out” message. Pressing the Select button clears the fault and restarts the system - no separate diagnostic cable required.

For advanced service needs, you can still use the Webasto PC Diagnostics Tool while the SmarTemp controller is connected. Just note: if you plan to run the heater during diagnostics, you’ll need to pull the power fuse to the SmarTemp 3.0 first to avoid system conflicts.

This combination of real-time diagnostics and historical fault storage helps users and technicians save time, reduce guesswork, and quickly restore heat - especially in remote or off-grid setups.

For users or technicians who want even deeper insight, the SmarTemp 3.0 BT also provides real-time system data and advanced reporting options.

Beyond basic scheduling and diagnostics, the SmarTemp 3.0 Bluetooth controller offers in-depth real-time system monitoring. This feature gives users and technicians a live view of key operating parameters - right from the controller screen.

Depending on the connected heater model, the controller displays:

• Supply voltage
• Output temperature
• Combustion air fan speed
• Fuel pump rate
• Glow plug activity
• Heating energy and flame detector status

Each value is represented using clear bar graphs and indicator lights showing active/inactive states. The interface is divided into three data areas:

1. Operational Info Panel – Displays internal system settings such as voltage thresholds, software version, and other programmed parameters.
2. Operating Data Panel – Shows total heater runtime, pre-heat and supplemental heat durations, and usage history.
3. Error Code Panel – Lists up to five stored or current faults, with details such as: 

• • Whether the fault is active or stored
  • Number of occurrences (fault counter)
  • Code details and advanced diagnostic info

These insights help users and service teams detect patterns, confirm heater health, and troubleshoot accurately.

The SmarTemp 3.0 BT also supports customer report exports. Users can share heater performance and diagnostic data via:

• Text message
• Email
• Or other mobile communication apps

The adapter depends on your heater model and current controller type:

• Part number 5013929B for Air Top 2000 STC (if your current controller is a rheostat)
• Part number 5013930A for Air Top EVO 40/55 (if your current controller is a rheostat)
• Part number 5013931A for Air Top 2000 STC or EVO 40/55 (if your current controller is SmarTemp 2.0)
• Part number 5013932A for Thermo Top Evo and Thermo Pro 50 (if your current controller is a rocker switch)
• Part number 5013885A for Thermo Pro 90 or Pro 150 (if your current controller is a rocker switch)

Yes. It supports both Webasto air heaters (Air Top series) and water/coolant heaters (Thermo Top Evo, Pro series).

Yes, if you're comfortable with heater wiring and have the correct adapter. Some heaters may require dealer programming or firmware updates.

Yes. The Webasto app connects to the controller via Bluetooth. You can download the Webasto app by scanning this QR Code:

Both offer scheduling and diagnostics, but only the 3.0 BT supports mobile Bluetooth control.

Yes. The controller stores your timer and temperature settings even when briefly disconnected from power.

No. The SmarTemp 3.0 BT is designed to control one Webasto heater at a time.

Typical range is up to 30 feet, depending on your vehicle’s interior structure. Steel partitions and similar may reduce the range.

Need more guidance? Review the product

Download the official Webasto SmarTemp 3.0 Installation & Operation Manual (PDF)

The Webasto SmarTemp 3.0 Bluetooth is the most capable and flexible diesel heater controller available in 2025. Whether you're heating a fleet truck, off-grid van, service vehicle, or marine cabin, it brings modern features like mobile control, error diagnostics, and precise scheduling into one compact interface.

If you think you need an upgrade, you can find the timer here - Webasto SmarTemp 3.0 Bluetooth Timer and take advantage of our fast, reliable shipping service.