# Troubleshooting
## MULTI-Module LEDs
LEDs are present on most external MULTI-Modules and can be used to check the status of the module.
The basic functions of the LEDs are:
**Green LED** - indicates that the MULTI-Module is receiving power\
**Red LED** - indicates the status of the MULTI-Module
{% hint style="warning" %}
On TMX5 modules the red LED patterns are reversed. (Also note that TMX5 modules are [not officially supported.](/basics/module-hardware/unsupported-modules.md))
{% endhint %}
| Red LED State | Pattern | Meaning |
| ----------------- | ---------------------------------------------- | -------------------------------------------------------------------------------------------- |
| Off | Off | The module is not functioning. |
| Flashing | On 0.05s; Off 1s | The selected protocol is not available on the module. |
| Inverted Flashing | On 1s; Off 0.1s | Waiting for bind to be initiated. |
| Fast Blink | On 0.1s; Off 0.1s | Binding in progress. |
| Slow Blink | On 0.5s; Off 0.5s | Module is in Serial Mode but there is no signal from the radio. |
| Very Slow Blink | On 1s; Off 1s | Module is in PPM Mode but there is no signal from the radio. |
| Fast Double Blink | On 0.1s; Off 0.1s;
On 0.1s; Off 0.5s
| Serial debugging is waiting for a serial connection. |
| On | On | The module is operating (transmitting). |
| SOS | Three short; three long; three short | The firmware has detected that it is running on an MCU with less than 128KB of flash memory. |
## Module Status
OpenTX and EdgeTX will display the state of the MULTI-Module in the **Module Status** line of the RF module section on the **Model Setup** page.
### Normal Operation
In normal operation the Module Status will display the MULTI-Module firmware version and the Expected Channel Order.
If an auto-binding protocol is selected, and binding has not yet been initiated, the Module Status will display "Bind to load protocol".
When the module is binding, the Module Status will display the firmware version followed by "Binding".
### No MULTI Telemetry
{% hint style="warning" %}
If the Module Status displays "No MULTI\_TELEMETRY" or "No telemetry" there is a problem with the MULTI-Module
{% endhint %}
In this situation, one of the following may be the cause:
* The selected module is not installed - External is selected when Internal should be, or vice-versa
* The wrong firmware is installed on the module - the wrong radio firmware, or telemetry inversion setting was used
* The module is defective
* A somewhat common fault is bad solder joints on the 5-pin module bay connector
## **Getting Help**
There are two ways to get help:
**RC Groups Forum** - for general 'how-to' questions or advice from other users\
**GitHub Issues** - for reporting bugs or serious issues
{% hint style="info" %}
RC Groups is usually the best place to start as the forum is very active, with many experienced users who can provide help and answer questions.
{% endhint %}
To make it easier to provide help, please include the following information:
* MULTI-Module type and the firmware version
* Radio type, firmware, and firmware version
* Using PPM or Serial
* Description of what the LED on the MULTI-Module and the receiver/model are doing
* Explanation of the behaviour and reproduction steps
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://www.multi-module.org/using-the-module/troubleshooting.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.