> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/docs/ion/help-and-how-to/troubleshooting.md).

# Troubleshooting

## ION Control System

<table data-view="cards"><thead><tr><th></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>Power Distribution Hub</strong><br><br><a href="/ion-control/pdh/troubleshooting.md">PDH Troubleshooting</a><br><br><a href="/ion-control/pdh/troubleshooting.md#breakers-are-difficult-to-extract">Breakers are difficult to extract</a><br><br><a href="/ion-control/pdh/status-led.md">PDH Status LED Patterns</a></td><td><a href="https://953213854-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FhlYDlT3pKdrfxexi4cPK%2Fuploads%2FMSOkyqRhgGGoFsc1J9Eg%2FPDH_GB-Card.png?alt=media&amp;token=af4f0782-dcdc-4461-981f-8448848d9995">PDH_GB-Card.png</a></td></tr><tr><td><strong>Pneumatic Hub</strong><br><br><a href="/ion-control/ph/troubleshooting.md">PH Troubleshooting</a><br><br><a href="/ion-control/ph/troubleshooting.md#compressor-test-mode">Compressor Test Mode</a><br><br><a href="/ion-control/ph/status-led.md">PH Status LED Patterns</a></td><td><a href="https://953213854-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FhlYDlT3pKdrfxexi4cPK%2Fuploads%2FqX0cKgKyxF8aW0yiHGIR%2FPH_GB-Card.png?alt=media&amp;token=2724b06a-f0b4-4ef7-a02b-c969d69d65ca">PH_GB-Card.png</a></td></tr><tr><td><strong>Other Control System</strong><br><br><a href="/ion-control/mpm/status-led.md">Mini Power Module Status LED Patterns</a><br><br><a href="/rev-crossover-products/servo/servo-hub/troubleshooting.md">Servo Hub Troubleshooting</a><br><br><a href="/ion-control/rpm/rpm-compatibility-with-the-new-frc-radio.md">RPM Compatibility with the new FRC Radio</a></td><td><a href="https://953213854-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FhlYDlT3pKdrfxexi4cPK%2Fuploads%2FNNQmhPON1WNxuO8tBKFD%2FOther_GB-Card.png?alt=media&amp;token=4752a6a8-3b8e-4c47-a880-1383ab1f749e">Other_GB-Card.png</a></td></tr></tbody></table>

## ION Brushless

<table data-card-size="large" data-view="cards"><thead><tr><th></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>SPARK Flex</strong><br><br><a href="/brushless/spark-flex/troubleshooting.md">SPARK Flex Troubleshooting</a><br><br><a href="/brushless/spark-flex/status-led.md">SPARK Flex Status LED Patterns</a><br><br><a href="/rev-hardware-client/ion/spark-flex.md">SPARK Flex with the REV Hardware Client</a></td><td><a href="https://953213854-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FhlYDlT3pKdrfxexi4cPK%2Fuploads%2Fj8RxuGygEYIbH0KlOFoD%2FSPARK%20Flex_GB-Card.png?alt=media&amp;token=bb6f740d-6544-4b23-8633-73d5f8a72434">SPARK Flex_GB-Card.png</a></td></tr><tr><td><strong>SPARK MAX</strong><br><br><a href="/brushless/spark-max/troubleshooting.md">SPARK MAX Troubleshooting</a><br><br><a href="/brushless/spark-max/status-led.md">SPARK MAX Status LED Patterns</a><br><br><a href="/rev-hardware-client/ion/spark-max.md">SPARK MAX with the REV Hardware Client</a></td><td><a href="https://953213854-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FhlYDlT3pKdrfxexi4cPK%2Fuploads%2FnGTHOKa0JBKB5hSqQEAV%2FSPARK%20MAX_GB-Card.png?alt=media&amp;token=4accae77-750a-437a-981a-14332b917dc4">SPARK MAX_GB-Card.png</a></td></tr></tbody></table>