Truma iNet Box
The Truma iNet Box is developed for controlling iNet-capable devices such as smartphones or tablet PCs using Bluetooth or GSM communication. It enables remote operation of connected appliances like heaters and air conditioners via the Truma App or SMS.
View official manual on manufacturer's site ↗Technical Specifications
Power Consumption 12v40 mA (12 V), 20 mA (24 V)
Weight Kgaprox. 150 g
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
Truma iNet Box not ready for operation (green LED does not illuminate) | The iNet Box isn't ready to use and its power LED is off. | — | Check all plug-in connections and ensure there is a sufficient voltage supply. | DIY Safe |
Truma iNet Box not ready for use (green LED stays off) | The iNet Box isn't ready to use and its power LED is off. | — | Check all electrical plug connections and ensure sufficient supply voltage. / Check all plug connections and ensure a sufficient power supply. | DIY Safe |
Cannot control connected appliances | Connected devices cannot be controlled through the system. | — | Check the operational availability of the Truma iNet Box, verify correct connections and operational status of connected devices, and restart the iNet Box by disconnecting the power supply for approx. 10 seconds. | DIY Safe |
Poor network coverage | Poor network coverage for GSM communication. | — | Check the mounting of the Truma iNet Box, verify network coverage at your current location, check the internal/external GSM antenna switch, and confirm whether your mobile provider supports 2G (GSM) network connections. | DIY Safe |
Operation not possible (red LED illuminates) | GSM operation is not possible and the red LED illuminates. | — | Check the operability of the mini SIM card (e.g., if it was blocked by the operator), verify the PIN in the Truma App configuration assistant, and check the internal/external GSM antenna switch. | DIY Safe |
Operation not possible (only GSM operation possible) - Bluetooth | Bluetooth operation is failing while GSM works. | — | Make sure Bluetooth is switched on and connected on your phone or tablet, that its battery isn't low, and that you're within range, then set up the Bluetooth connection again. | DIY Safe |
Truma iNet Box not ready for use (green LED off) | The device is not receiving sufficient power or has a bad connection. | — | Check every plug connection and that the power supply is adequate. | DIY Safe |
Connected appliances can't be controlled | Communication failure or connected appliances are not ready. | — | Check the iNet Box is ready to use and its connections are sound, then restart it by cutting its power for around 10 seconds. | DIY Safe |
Nothing can be operated (red LED lit) | GSM operation is not possible or SIM card issues exist. | — | Check the Mini-SIM card works and isn't blocked, check the PIN in the Truma App's setup assistant, and check the switch for the internal/external GSM aerial. | DIY Safe |
No operation possible via Bluetooth (only GSM operation possible) | Bluetooth connection is inactive or out of range. | — | Make sure Bluetooth is on and connected on your phone or tablet and that you're within range, then set up the Bluetooth connection again. | DIY Safe |
Connected appliances cannot be controlled / Connected appliances cannot be controlled | Connected appliances cannot be controlled via the iNet system. | — | Check the operating readiness of the Truma iNet Box and the correctness of the connections, and perform a restart by interrupting the supply voltage for approx. 10 seconds. / Check operating readiness, correct connection, and perform a restart by disconnecting the power supply for approx. 10 seconds. | DIY Safe |
Device is not operating / Operation is not possible (red LED lights up / red LED lights up) | GSM operation is not possible due to a configuration or SIM error. | — | Check the function of the mini SIM card, verify the PIN code in the Truma App installation wizard, and check the internal/external GSM antenna switch. / Check the functionality of the Mini SIM card, the PIN code, and the antenna switch. | DIY Safe |
Frequently Asked Questions
Q: How many phones or tablets can connect to the Truma iNet Box over Bluetooth?
You can register several devices, and as many as four of them can be in control at the same time.
Q: Is the use of a mini SIM card mandatory?
No - it works without a mini SIM card too, but you're then limited to controlling it nearby over Bluetooth.
Q: How is the factory settings reset performed?
Keep the iNet Box's button pressed for 20 seconds or more; a short flash of the blue LED confirms the reset is done.
Q: What kind of SIM card is required for the Truma iNet Box?
A Mini-SIM card (25 x 15 mm) with its own call number, sufficient credit, and a 2G mobile network (GSM) connection is required.
Q: How many mobile devices can be connected simultaneously?
Up to four phones or tablets can operate it at the same time.
Q: How do I reset the Truma iNet Box to factory settings?
Press the button on the top view for at least 20 seconds until the blue LED lights up briefly, indicating the reset and TIN2 appliance search are complete.
Q: What network is required for SMS remote control?
The Truma iNet Box needs a mini SIM card and a 2G (GSM) mobile signal before it can send or receive text messages.