diff --git a/app/(chat)/api/chat/_lib/image-failover.ts b/app/(chat)/api/chat/_lib/image-failover.ts
index 0f7870ba7..2ae73f80d 100644
--- a/app/(chat)/api/chat/_lib/image-failover.ts
+++ b/app/(chat)/api/chat/_lib/image-failover.ts
@@ -70,7 +70,16 @@ export function shouldCooldownImageFallbackModel(errorMessage: string): boolean
     msg.includes("api key is missing") ||
     msg.includes("invalid api key") ||
     msg.includes("unauthorized") ||
-    msg.includes("cannot convert argument to a bytestring")
+    msg.includes("cannot convert argument to a bytestring") ||
+    msg.includes("model maintenance") ||
+    msg.includes("maintenance") ||
+    msg.includes("维护中") ||
+    msg.includes("维护") ||
+    msg.includes("service unavailable") ||
+    msg.includes("temporarily unavailable") ||
+    msg.includes("系统繁忙") ||
+    msg.includes("无可用渠道") ||
+    /(?:^|\D)(?:429|500|502|503|504)(?:\D|$)/.test(msg)
   );
 }
 
diff --git a/lib/ai/runtime/model-health.ts b/lib/ai/runtime/model-health.ts
index 99b539624..ca7623ebb 100644
--- a/lib/ai/runtime/model-health.ts
+++ b/lib/ai/runtime/model-health.ts
@@ -162,6 +162,8 @@ export function classifyAiModelHealthFailure(error: unknown): {
     normalized.includes("504") ||
     normalized.includes("model maintenance") ||
     normalized.includes("maintenance") ||
+    normalized.includes("维护中") ||
+    normalized.includes("维护") ||
     normalized.includes("修复中") ||
     normalized.includes("系统繁忙") ||
     normalized.includes("no available channel") ||
@@ -219,6 +221,8 @@ export function shouldFailoverAiModelError(error: unknown) {
       normalized.includes("temporarily unavailable") ||
       normalized.includes("model maintenance") ||
       normalized.includes("maintenance") ||
+      normalized.includes("维护中") ||
+      normalized.includes("维护") ||
       normalized.includes("修复中") ||
       normalized.includes("系统繁忙") ||
       normalized.includes("无可用渠道")