# 503 engine_unavailable

**The resolution engine cannot be reached.**

- HTTP status: 503
- Problem identifier (`type` field): `https://noryo.app/problems/transactions/engine_unavailable`

[← Errors — Transaction Intelligence](https://developer.noryo.app/en-GB/transaction-intelligence/errors)

---

Canonical page: https://developer.noryo.app/en-GB/transaction-intelligence/errors/engine_unavailable