diff --git a/app/services/modbus/polling_service.rb b/app/services/modbus/polling_service.rb
index 1b0fe2c..f4bbc60 100644
--- a/app/services/modbus/polling_service.rb
+++ b/app/services/modbus/polling_service.rb
@@ -5,7 +5,7 @@ module Modbus
   class PollingService
     class << self
       def start
-        return if @scheduler && @scheduler.jobs.any?
+        return if @scheduler
 
         puts "[#{Time.current}] Modbus polling service 시작됨 (Rufus)"
         @scheduler ||= Rufus::Scheduler.new
@@ -30,7 +30,7 @@ module Modbus
       end
 
       def running?
-        @scheduler && @scheduler.jobs.any?
+        @scheduler
       end
 
       private