diff --git a/scanner.py b/scanner.py
index 58c907b..323561a 100644
--- a/scanner.py
+++ b/scanner.py
@@ -2520,7 +2520,7 @@ def home_wait(self, home_end_time):
         ffi_lib.trdispatch_stop(self._trdispatch)
         res = [trsync.stop() for trsync in self._trsyncs]
         if any([r == etrsync.REASON_COMMS_TIMEOUT for r in res]):
-            return -1.0
+            raise self.scanner.printer.command_error("Communication timeout during homing")
         if res[0] != etrsync.REASON_ENDSTOP_HIT:
             return 0.0
         if self._mcu.is_fileoutput():