---
title: "startDiagnostics(completion:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterenergyevse/startdiagnostics(completion:)"
---

# startDiagnostics(completion:)

## Declaration

```swift
func startDiagnostics(completion: @escaping @Sendable ((any Error)?) -> Void)
```

```swift
func startDiagnostics() async throws
```