# Dexcom CGM Troubleshooting: 30-Minute Warm-Up Issues

> Follow these troubleshooting steps youre having trouble with your Dexcom CGM during the 30minute warm up period       Check that you disconnected your previo

Source: https://support.nutrisense.io/en_us/dexcom-cgm-troubleshooting-30-minute-warmup-issues-rydL1cRyxx

Last updated: 2026-01-05T17:11:24.029Z

If you're experiencing issues with your Dexcom CGM during the initial 30-minute warm-up period, follow these troubleshooting steps to resolve common problems quickly.

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## Initial Troubleshooting Steps

_Quick fixes to try first before contacting support_

**Important:** These steps resolve most warm-up issues within 20 minutes.

### Step 1: Verify Previous Sensor Disconnection

Ensure your previous CGM sensor session has been properly ended:

1.  Open the **Dexcom G7 app**
2.  Tap **"Connections"** along the bottom of the screen
3.  Tap **"Sensor"** at the top of the screen
4.  Tap the **"STOP SENSOR SESSION"** button

### Step 2: Reconnect and Reactivate

Repeat your complete sensor connection and activation process from the beginning.

### Step 3: Wait for Resolution

**⏱️ Wait exactly 20 minutes** to determine if the problem resolves automatically.

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## When to Contact Support

_Next steps if troubleshooting doesn't resolve the issue_

**Still seeing 'Sensor Failed' after 20 minutes?** It's time to get help.

If you continue to receive a **'Sensor Failed'** notification after completing all steps and waiting 20 minutes, contact our support team:

*   **Support request:** Submit a detailed request [**HERE**](https://support.nutrisense.io/hc/en-us/requests/new)

**💡 Pro Tip:** When contacting support, mention which troubleshooting steps you've already tried to speed up the resolution process.