500-503 errors are the most generic 500 series codes and can happen when an app’s server is down or experiencing other issues.
Check Zapier's status page and the app’s status page for information on on outages, maintenance, or downtime. If there is no relevant information, reach out to the app's team, or wait for the error to resolve.
If the 500 error occurred on your trigger app, no further action is needed because your Zap will run properly the next time Zapier can successfully poll the trigger. If the 500 error occurred on your action app, you can manually replay affected tasks.