The FarmBot wiki would be a good place for user-editable troubleshooting solutions. Your post about using the FarmBot wiki is a good intro. We can also add more topics to the FAQ category.
Are you thinking of something like this?
Software-related:
Error: Your web browser is unable to connect to the message broker (MQTT). You might be behind a firewall or disconnected from the Internet. Check your network settings.
Affected systems: Browser, network.
Potential Solutions: Reconnect to the internet, refresh the page, and check your browser compatibility and network access.
Resources: forum topic
Error: Error downloading data. Please try refreshing the page.
Affected systems: Browser, network, account credentials.
Potential Solutions: Refresh the page, logout and log back in, and check your internet connection.
Resources: forum topic
Error: Please Update. You are using an old version of FarmBot OS.
Affected systems: FarmBot OS
Potential Solutions: Press the UPDATE button in the Device widget on the Device page.
Resources: forum topic
Error: Disconnected. FarmBot is not connected.
Affected systems: FarmBot OS, Browser.
Potential Solutions: Check device power, device configuration, internet access, and browser compatibility.
Resources: forum topic
Error: Your web browser is having trouble connecting to the configurator. The automatic pop-up window for connecting to networks on apple devices does not work with the FarmBot WiFi configurator.
Affected systems: FarmBot OS, Browser.
Potential Solutions: Check device power, network, and browser compatibility.
Resources: forum topic
Error: Could not find sequence by ID.
Affected systems: FarmBot OS.
Potential Solutions: Sync your device by pressing SYNC NOW.
Resources: Sequences are created in the Web App, but run on FarmBot OS. A sequence needs to be synced to the device before it can be used by FarmBot.
Hardware-related: (also see Why is my FarmBot not moving? and Are my encoders working?)
Problem: Motors don’t stop at axis end while homing.
Troubleshooting Tips: Try pushing back a motor while its moving, or view encoder positions in the Move widget on the Controls page.
Potential Solutions: Check encoder wiring, change encoder settings.