# Vial Troubleshooting

- [Replacing Photodiodes and LEDs](/evolver/troubleshooting/vial-troubleshooting/replacing-photodiodes-and-leds.md)
- [Heating Element](/evolver/troubleshooting/vial-troubleshooting/heating-element.md)
- [Stirring](/evolver/troubleshooting/vial-troubleshooting/stirring.md)