Error codes look intimidating, but nearly all of them are one of five everyday problems wearing a technical costume. Learn the five and you’ll fix most issues yourself.
The five common causes
| Cause | What it means | Fix |
|---|---|---|
| Not opted in | The person didn’t give permission | Get a valid opt-in |
| Window closed | 24h+ since their last message | Send an approved template |
| Template not approved | It’s still pending or rejected | Wait, or fix and resubmit |
| Invalid number | The number isn’t on WhatsApp | Remove/clean it |
| Low balance | Your wallet is empty | Top up |
Example: a store’s broadcast fails with a “window closed” error. The customers hadn’t messaged in over a day — the fix is to start with a template, not to retry the same free-form message.
Quick fixes by symptom
"Not opted in" → collect opt-in, then message
"Outside window" → use an approved template
"Template rejected" → clearer content + right category, resubmit
"Invalid recipient" → remove the bad number
"Insufficient funds" → top up your walletMost rejected-template issues come down to content and category — revisit templates explained. Most permission errors vanish once you fix opt-in.
When to ask for help
If an error doesn’t match any of the five — or keeps happening after you’ve fixed the obvious cause — get support with a screenshot of the exact error. For deep technical references, the developer docs list specific codes.