> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/s2gw-installation-manual/troubleshooting-1/bad-or-no-readings-from-a-sensor.md).

# Bad or no readings from a sensor

## Problems observed

The radio node is powered on and has the sensor(s) connected but B3 has no readings or the readings are incorrect.

## Reason

The reason may be an incorrect type saved in the [List of initialised sensors](/s2gw-installation-manual/troubleshooting/udp_listen_log_contents/list-of-initialised-sensors.md) in S2GW.

At the moment only one such case was observed when Heraeus Temp sensor type was assigned to both T and RH sensors of SHT75. The reason of such an error was not yet defined.

The incorrect list where 4\_0 and 4\_1 are incorrect types:

```
[2/26/2025 12:07:04 PM:289] [S2Gateway] ************************
[2/26/2025 12:07:04 PM:289] [S2Gateway] List of current sensors:
[2/26/2025 12:07:04 PM:291] [S2Gateway] 2_2 - AnalogueValueConverter
[2/26/2025 12:07:04 PM:291] [S2Gateway] 3_0 - SHT75ValueConverter: Humidity
[2/26/2025 12:07:04 PM:292] [S2Gateway] 4_1 - HeraeusBBD6220TemperatureValueConverter
[2/26/2025 12:07:04 PM:293] [S2Gateway] 2_3 - AnalogueValueConverter
[2/26/2025 12:07:04 PM:294] [S2Gateway] 4_0 - HeraeusBBD6220TemperatureValueConverter
[2/26/2025 12:07:04 PM:295] [S2Gateway] 9_0 - SHT75ValueConverter: Humidity
[2/26/2025 12:07:04 PM:296] [S2Gateway] 9_1 - SHT75ValueConverter: Temperature
[2/26/2025 12:07:04 PM:296] [S2Gateway] 7_0 - DallasValueConverter
[2/26/2025 12:07:04 PM:297] [S2Gateway] 10_2 - AnalogueValueConverter
[2/26/2025 12:07:04 PM:298] [S2Gateway] 3_1 - SHT75ValueConverter: Temperature
[2/26/2025 12:07:04 PM:299] [S2Gateway] 5_0 - PT100V2ValueConverter
[2/26/2025 12:07:04 PM:300] [S2Gateway] 5_1 - PT100V2ValueConverter
[2/26/2025 12:07:04 PM:301] [S2Gateway] 6_0 - PT100V2ValueConverter
[2/26/2025 12:07:04 PM:301] [S2Gateway] 10_1 - AnalogueValueConverter
[2/26/2025 12:07:04 PM:302] [S2Gateway] 8_0 - DallasValueConverter
[2/26/2025 12:07:04 PM:303] [S2Gateway] ************************
```

## Solution

If the index of a sensor with a wrong type is not changed then its type will be never checked. 

The simplest method to redo the initialisation is to change the index to a non existing one, wait until the new configuration is transmitted to S2GW, which can be checked in XML log, and then change it again to correct value. This will cause the sensor initialisation and will correct the sensor type basing on its answer over radio.

Another option is to reset the S2GW by power cycle or using Putty if it can be accessed.

The list after reboot and full initialisation where 4\_0 and 4\_1 are correct:

```
[2/26/2025 12:33:22 PM:816] [S2Gateway] ************************
[2/26/2025 12:33:22 PM:817] [S2Gateway] List of current sensors:
[2/26/2025 12:33:22 PM:818] [S2Gateway] 10_2 - AnalogueValueConverter
[2/26/2025 12:33:22 PM:819] [S2Gateway] 2_2 - AnalogueValueConverter
[2/26/2025 12:33:22 PM:819] [S2Gateway] 3_0 - SHT75ValueConverter: Humidity
[2/26/2025 12:33:22 PM:820] [S2Gateway] 3_1 - SHT75ValueConverter: Temperature
[2/26/2025 12:33:22 PM:821] [S2Gateway] 4_1 - SHT75ValueConverter: Temperature
[2/26/2025 12:33:22 PM:822] [S2Gateway] 2_3 - AnalogueValueConverter
[2/26/2025 12:33:22 PM:832] [S2Gateway] 4_0 - SHT75ValueConverter: Humidity
[2/26/2025 12:33:22 PM:833] [S2Gateway] 9_0 - SHT75ValueConverter: Humidity
[2/26/2025 12:33:22 PM:835] [S2Gateway] 9_1 - SHT75ValueConverter: Temperature
[2/26/2025 12:33:22 PM:836] [S2Gateway] 7_0 - DallasValueConverter
[2/26/2025 12:33:22 PM:837] [S2Gateway] 5_0 - PT100V2ValueConverter
[2/26/2025 12:33:22 PM:838] [S2Gateway] 5_1 - PT100V2ValueConverter
[2/26/2025 12:33:22 PM:839] [S2Gateway] 6_0 - PT100V2ValueConverter
[2/26/2025 12:33:22 PM:840] [S2Gateway] 10_1 - AnalogueValueConverter
[2/26/2025 12:33:22 PM:841] [S2Gateway] 8_0 - DallasValueConverter
[2/26/2025 12:33:22 PM:842] [S2Gateway] ************************
```


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