diff --git a/Framework/PythonInterface/plugins/algorithms/HB2AReduce.py b/Framework/PythonInterface/plugins/algorithms/HB2AReduce.py
index 21cfbd78d65ef963bfb9d294188109583dbf75cb..b676cfa27ab5bd9dafba7a9638fb871cb4768007 100644
--- a/Framework/PythonInterface/plugins/algorithms/HB2AReduce.py
+++ b/Framework/PythonInterface/plugins/algorithms/HB2AReduce.py
@@ -36,9 +36,13 @@ class HB2AReduce(PythonAlgorithm):
     def PyInit(self):
         self.declareProperty(MultipleFileProperty(name="Filename", action=FileAction.OptionalLoad,
                                                   extensions=[".dat"]), "Data files to load")
+        condition = EnabledWhenProperty("Filename", PropertyCriterion.IsDefault)
         self.declareProperty('IPTS', Property.EMPTY_INT, "IPTS number to load from")
+        self.setPropertySettings("IPTS", condition)
         self.declareProperty('Exp', Property.EMPTY_INT, "Experiment number to load from")
+        self.setPropertySettings("Exp", condition)
         self.declareProperty(IntArrayProperty("ScanNumbers", []), 'Scan numbers to load')
+        self.setPropertySettings("ScanNumbers", condition)
         self.declareProperty(FileProperty(name="Vanadium", defaultValue="", action=FileAction.OptionalLoad, extensions=[".dat", ".txt"]),
                              doc="Vanadium file, can be either the vanadium scan file or the reduced vcorr file. "
                              "If not provided the vcorr file adjacent to the data file will be used")
@@ -64,10 +68,16 @@ class HB2AReduce(PythonAlgorithm):
         issues = dict()
 
         if not self.getProperty("Filename").value:
-            if ((self.getProperty("IPTS").value == Property.EMPTY_INT) or
-                (self.getProperty("Exp").value == Property.EMPTY_INT) or
-               len(self.getProperty("ScanNumbers").value) is 0):
-                issues["Filename"] = 'Must specify either Filename or IPTS AND Exp AND ScanNumbers'
+            ipts = self.getProperty("IPTS").value
+
+            if ((ipts == Property.EMPTY_INT) or len(self.getProperty("ScanNumbers").value) is 0):
+                issues["Filename"] = 'Must specify either Filename or IPTS AND ScanNumbers'
+
+            if self.getProperty("Exp").value == Property.EMPTY_INT:
+                exp_list = sorted(e for e in os.listdir('/HFIR/HB2A/IPTS-{0}'.format(ipts)) if 'exp' in e)
+                if len(exp_list)>1:
+                    exps = ','.join(e.replace('exp','') for e in exp_list)
+                    issues["Exp"] = 'Multiple experiments found in IPTS-{}. You must set Exp to one of {}'.format(ipts, exps)
 
         return issues
 
@@ -78,6 +88,8 @@ class HB2AReduce(PythonAlgorithm):
         if not filenames:
             ipts = self.getProperty("IPTS").value
             exp = self.getProperty("Exp").value
+            if self.getProperty("Exp").value == Property.EMPTY_INT:
+                exp = int([e for e in os.listdir('/HFIR/HB2A/IPTS-{0}'.format(ipts)) if 'exp' in e][0].replace('exp',''))
             filenames = ['/HFIR/HB2A/IPTS-{0}/exp{1}/Datafiles/HB2A_exp{1:04}_scan{2:04}.dat'.format(ipts, exp, scan)
                          for scan in self.getProperty("ScanNumbers").value]
 
diff --git a/docs/source/algorithms/HB2AReduce-v1.rst b/docs/source/algorithms/HB2AReduce-v1.rst
index e6de3a6de2cfd578676ef20622a2e123b90986cb..04833004af72f39995e16574180246081111184c 100644
--- a/docs/source/algorithms/HB2AReduce-v1.rst
+++ b/docs/source/algorithms/HB2AReduce-v1.rst
@@ -11,7 +11,7 @@ Description
 
 This algorithm reduces HFIR POWDER (HB-2A) data.
 
-You can either specify the filenames of data you want to reduce or provide the IPTS, exp and scan number. *e.g.* the following are equivalent:
+You can either specify the filenames of data you want to reduce or provide the IPTS, exp and scan number. If only one experiment exists in an IPTS then exp can be omitted. *e.g.* the following are equivalent:
 
 .. code-block:: python