diff --git a/tests/scripts/test_frame_synchronizer.py b/tests/scripts/test_frame_synchronizer.py
index 87c784cf7..8d2915f0a 100644
--- a/tests/scripts/test_frame_synchronizer.py
+++ b/tests/scripts/test_frame_synchronizer.py
@@ -20,6 +20,7 @@ from utils_for_test import (
     cleanSharedmemory,
     startProcessInBackground,
     startProcessInBackgroundWithLogFile,
+    checkLogForErrors,
     startDetectorVirtualServer,
     loadConfig,
     ParseArguments
@@ -34,6 +35,9 @@ def startFrameSynchronizerPullSocket(name, fp):
     fname = PULL_SOCKET_PREFIX_FNAME + name + '.txt'
     cmd = ['python', '-u', 'frameSynchronizerPullSocket.py']  
     startProcessInBackgroundWithLogFile(cmd, fp, fname)
+    time.sleep(1)
+    checkLogForErrors(fp, fname)
+    
 
 
 def startFrameSynchronizer(num_mods, fp):
@@ -44,16 +48,14 @@ def startFrameSynchronizer(num_mods, fp):
     time.sleep(1)
 
 
-def acquire(fp):
+def acquire(fp, det):
     Log(LogLevel.INFO, 'Acquiring')
     Log(LogLevel.INFO, 'Acquiring', fp)
-    d = Detector()
-    d.acquire()
+    det.acquire()
 
 
-def testFramesCaught(name, num_frames):
-    d = Detector()
-    fnum = d.rx_framescaught[0]
+def testFramesCaught(name, det, num_frames):
+    fnum = det.rx_framescaught[0]
     if fnum != num_frames:
         raise RuntimeException(f"{name} caught only {fnum}. Expected {num_frames}") 
     
@@ -61,7 +63,7 @@ def testFramesCaught(name, num_frames):
     Log(LogLevel.INFOGREEN, f'Frames caught test passed for {name}', fp)
 
 
-def testZmqHeadetTypeCount(name, num_mods, num_frames, fp):
+def testZmqHeadetTypeCount(name, det, num_mods, num_frames, fp):
 
     Log(LogLevel.INFO, f"Testing Zmq Header type count for {name}")
     Log(LogLevel.INFO, f"Testing Zmq Header type count for {name}", fp)
@@ -88,8 +90,7 @@ def testZmqHeadetTypeCount(name, num_mods, num_frames, fp):
                     continue
 
         # test if file contents matches expected counts
-        d = Detector()
-        num_ports_per_module = 1 if name == "gotthard2" else d.numinterfaces
+        num_ports_per_module = 1 if name == "gotthard2" else det.numinterfaces
         total_num_frame_parts = num_ports_per_module * num_mods * num_frames
         for htype, expected_count in [("header", num_mods), ("series_end", num_mods), ("module", total_num_frame_parts)]:
             if htype_counts[htype] != expected_count:
@@ -111,10 +112,10 @@ def startTestsForAll(args, fp):
             startDetectorVirtualServer(server, args.num_mods, fp)
             startFrameSynchronizerPullSocket(server, fp)
             startFrameSynchronizer(args.num_mods, fp)
-            loadConfig(name=server, rx_hostname=args.rx_hostname, settingsdir=args.settingspath, fp=fp, num_mods=args.num_mods, num_frames=args.num_frames)
-            acquire(fp)
-            testFramesCaught(server, args.num_frames)
-            testZmqHeadetTypeCount(server, args.num_mods, args.num_frames, fp)
+            d = loadConfig(name=server, rx_hostname=args.rx_hostname, settingsdir=args.settingspath, fp=fp, num_mods=args.num_mods, num_frames=args.num_frames)
+            acquire(fp, d)
+            testFramesCaught(server, d, args.num_frames)
+            testZmqHeadetTypeCount(server, d, args.num_mods, args.num_frames, fp)
             Log(LogLevel.INFO, '\n')
         except Exception as e:
             raise RuntimeException(f'Synchronizer Tests failed') from e
diff --git a/tests/scripts/utils_for_test.py b/tests/scripts/utils_for_test.py
index f2ca16cee..1d64129cf 100644
--- a/tests/scripts/utils_for_test.py
+++ b/tests/scripts/utils_for_test.py
@@ -104,7 +104,7 @@ def startProcessInBackground(cmd, fp):
         raise RuntimeException(f'Failed to start {cmd}:{str(e)}') from e
 
 
-def startProcessInBackgroundWithLogFile(cmd, fp, log_file_name):
+def startProcessInBackgroundWithLogFile(cmd, fp, log_file_name: str):
     Log(LogLevel.INFOBLUE, 'Starting up ' +  ' '.join(cmd) + '. Log: ' +  log_file_name)
     Log(LogLevel.INFOBLUE, 'Starting up ' +  ' '.join(cmd) + '. Log: ' +  log_file_name, fp)
     try:
@@ -114,6 +114,22 @@ def startProcessInBackgroundWithLogFile(cmd, fp, log_file_name):
         raise RuntimeException(f'Failed to start {cmd}:{str(e)}') from e
 
 
+def checkLogForErrors(fp, log_file_path: str):
+    try:
+        with open(log_file_path, 'r') as log_file:
+            for line in log_file:
+                if 'Error' in line:
+                    Log(LogLevel.ERROR, f"Error found in log: {line.strip()}")
+                    Log(LogLevel.ERROR, f"Error found in log: {line.strip()}", fp)
+                    raise RuntimeException("Error found in log file")
+    except FileNotFoundError:
+        print(f"Log file not found: {log_file_path}")
+        raise
+    except Exception as e:
+        print(f"Exception while reading log: {e}")
+        raise
+
+
 def runProcessWithLogFile(name, cmd, fp, log_file_name):
     Log(LogLevel.INFOBLUE, 'Running ' +  name + '. Log: ' +  log_file_name)
     Log(LogLevel.INFOBLUE, 'Running ' +  name + '. Log: ' +  log_file_name, fp)
@@ -140,7 +156,7 @@ def startDetectorVirtualServer(name :str, num_mods, fp):
     for i in range(num_mods):
         port_no = SERVER_START_PORTNO + (i * 2)
         cmd = [name + 'DetectorServer_virtual', '-p', str(port_no)]
-        startProcessInBackground(cmd, fp)
+        startProcessInBackgroundWithLogFile(cmd, fp, "/tmp/virtual_det_" + name + str(i) + ".txt")
         match name:
             case 'jungfrau':
                 time.sleep(7)
@@ -201,6 +217,8 @@ def loadConfig(name, rx_hostname, settingsdir, fp, num_mods = 1, num_frames = 1)
         d.frames = num_frames
     except Exception as e:
         raise RuntimeException(f'Could not load config for {name}. Error: {str(e)}') from e
+    
+    return d
 
 
 def ParseArguments(description, default_num_mods=1):