diff --git a/src/main/ai/LocalOllamaProvider.ts b/src/main/ai/LocalOllamaProvider.ts
index 9e117b0..8ad96fb 100644
--- a/src/main/ai/LocalOllamaProvider.ts
+++ b/src/main/ai/LocalOllamaProvider.ts
@@ -5,6 +5,14 @@ import { buildVisionPrompt } from './visionPrompt.js';
 import type { GenerateInput, GenerateOptions, HealthResult, InferenceProvider } from './InferenceProvider.js';
 import { DEFAULT_OLLAMA_ENDPOINT, DEFAULT_OLLAMA_MODEL } from '../../shared/constants.js';
 
+function classifyFetchError(e: unknown): 'network' | 'timeout' | 'dns' | 'other' {
+  const msg = ((e as Error)?.message ?? '').toLowerCase();
+  if (msg.includes('aborted') || msg.includes('timeout')) return 'timeout';
+  if (msg.includes('econnrefused') || msg.includes('econnreset')) return 'network';
+  if (msg.includes('enotfound') || msg.includes('eai_again')) return 'dns';
+  return 'other';
+}
+
 export interface LocalOllamaOptions {
   endpoint?: string;
   model?: string;
@@ -119,7 +127,8 @@ export class LocalOllamaProvider implements InferenceProvider {
       return found ? { ok: true, model: this.model }
                    : { ok: false, reason: `${this.model} not installed` };
     } catch (err) {
-      return { ok: false, reason: `unreachable: ${(err as Error).message}` };
+      const cls = classifyFetchError(err);
+      return { ok: false, reason: `unreachable:${cls}` };
     }
   }
 }
diff --git a/tests/unit/LocalOllamaProvider.test.ts b/tests/unit/LocalOllamaProvider.test.ts
index f254bb5..b69da29 100644
--- a/tests/unit/LocalOllamaProvider.test.ts
+++ b/tests/unit/LocalOllamaProvider.test.ts
@@ -110,6 +110,44 @@ describe('LocalOllamaProvider', () => {
     expect(provider.name).toBe('local-ollama/gemma4:26b');
   });
 
+  describe('healthCheck PII reason masking', () => {
+    it('classifies ECONNREFUSED as network', async () => {
+      mock.get('http://192.168.1.5:11434').intercept({ path: '/api/tags', method: 'GET' })
+        .replyWithError(new Error('connect ECONNREFUSED 192.168.1.5:11434'));
+      const provider = new LocalOllamaProvider({ endpoint: 'http://192.168.1.5:11434' });
+      const h = await provider.healthCheck();
+      expect(h.ok).toBe(false);
+      expect(h.reason).toBe('unreachable:network');
+      expect(h.reason).not.toContain('192.168.1.5');
+    });
+
+    it('classifies AbortError/timeout as timeout', async () => {
+      mock.get('http://localhost:11434').intercept({ path: '/api/tags', method: 'GET' })
+        .replyWithError(new Error('The operation was aborted due to timeout'));
+      const h = await new LocalOllamaProvider().healthCheck();
+      expect(h.ok).toBe(false);
+      expect(h.reason).toBe('unreachable:timeout');
+    });
+
+    it('classifies ENOTFOUND as dns', async () => {
+      mock.get('http://nonexistent.local:11434').intercept({ path: '/api/tags', method: 'GET' })
+        .replyWithError(new Error('getaddrinfo ENOTFOUND nonexistent.local'));
+      const provider = new LocalOllamaProvider({ endpoint: 'http://nonexistent.local:11434' });
+      const h = await provider.healthCheck();
+      expect(h.ok).toBe(false);
+      expect(h.reason).toBe('unreachable:dns');
+      expect(h.reason).not.toContain('nonexistent.local');
+    });
+
+    it('falls back to other for unknown errors', async () => {
+      mock.get('http://localhost:11434').intercept({ path: '/api/tags', method: 'GET' })
+        .replyWithError(new Error('something weird happened'));
+      const h = await new LocalOllamaProvider().healthCheck();
+      expect(h.ok).toBe(false);
+      expect(h.reason).toBe('unreachable:other');
+    });
+  });
+
   describe('vision path (v0.3.1 Cut F)', () => {
     it('visionModel + images → body.images + model=visionModel + buildVisionPrompt', async () => {
       let capturedBody: string = '';