Workflow works manually but fails on activation (503 error)

Questions
1

Hi all,

I’m running into an issue with a workflow that works perfectly fine when executed manually, but throws a 503 error as soon as I try to activate it.

Here’s the setup in short:

  • Data is retrieved from a Google Sheet.

  • An HTTP (GET) node copies the sheet (needed for a new content calendar).

  • An AI Agent node processes data from the main sheet (only 10–40 rows, so manageable).

  • Output is parsed in a Code node (parser tools don’t align well with the JSON structure, so custom parsing works better).

  • Rows are then added to Excel.

  • Finally, another AI Agent generates an email for a control step

Everything runs smoothly in manual execution, but as soon as the workflow is active, I consistently get a 503 error.

Has anyone experienced something similar, or found a reliable workaround?

Scherm­afbeelding 2025-09-11 om 09.54.08
Scherm­afbeelding 2025-09-11 om 09.54.081732×797 206 KB

Thanks in advance for your help!

Robin

2

Hello @Robin_Calor

Try disabling the nodes until you will find which one is causing 502 errors.

3

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