diff --git a/python/lvmecp/actor/actor.py b/python/lvmecp/actor/actor.py
index 6dd4acb..45a72a8 100644
--- a/python/lvmecp/actor/actor.py
+++ b/python/lvmecp/actor/actor.py
@@ -169,7 +169,7 @@ async def _run_eng_mode(self, timeout: float | None = None):
         assert self._engineering_mode_duration is not None
 
         while True:
-            await self.emit_heartbeat()
+            # await self.emit_heartbeat()
 
             elapsed = time.time() - self._engineering_mode_started_at