diff --git a/modules/caissedepargne/pages.py b/modules/caissedepargne/pages.py
index 32bfbdffaf43743030114280518c3283a7d549a1..1f44ec8b87e0a51688d8e3b3991036197180663c 100644
--- a/modules/caissedepargne/pages.py
+++ b/modules/caissedepargne/pages.py
@@ -67,6 +67,11 @@ def float_to_decimal(f):
 
 
 class LoginPage(JsonPage):
+    def on_load(self):
+        error_msg = self.doc.get('error')
+        if error_msg and 'Le service est momentanément indisponible' in error_msg:
+            raise BrowserUnavailable(error_msg)
+
     def get_response(self):
         return self.doc