diff --git a/changelogs/fragments/1684-Add_validation_for_marker_begin_end.yml b/changelogs/fragments/1684-Add_validation_for_marker_begin_end.yml
new file mode 100644
index 000000000..067a17784
--- /dev/null
+++ b/changelogs/fragments/1684-Add_validation_for_marker_begin_end.yml
@@ -0,0 +1,4 @@
+bugfixes:
+  - zos_blockinfile - Previously module was not able to delete a block when 'marker_begin' and 'marker_end'
+    were set to the same value. Fix introduces a requirement for 'marker_begin' and 'marker_end' to have different values.
+    (https://github.com/ansible-collections/ibm_zos_core/pull/1684).
\ No newline at end of file
diff --git a/plugins/modules/zos_blockinfile.py b/plugins/modules/zos_blockinfile.py
index ab6d2a0dd..2befe61ef 100644
--- a/plugins/modules/zos_blockinfile.py
+++ b/plugins/modules/zos_blockinfile.py
@@ -96,6 +96,7 @@
   marker_begin:
     description:
     - This will be inserted at C({mark}) in the opening ansible block marker.
+    - Value needs to be different from marker_end.
     required: false
     type: str
     default: BEGIN
@@ -103,6 +104,7 @@
     required: false
     description:
     - This will be inserted at C({mark}) in the closing ansible block marker.
+    - Value must be different from marker_end.
     type: str
     default: END
   backup:
@@ -759,7 +761,8 @@ def main():
         marker_begin = 'BEGIN'
     if not marker_end:
         marker_end = 'END'
-
+    if marker_begin == marker_end:
+        module.fail_json(msg='marker_begin and marker_end must be different.')
     marker = "{0}\\n{1}\\n{2}".format(marker_begin, marker_end, marker)
     block = transformBlock(block, ' ', indentation)
     # analysis the file type