diff --git a/web/plugins/wato/check_parameters_nfsiostat.py b/web/plugins/wato/check_parameters_nfsiostat.py
index 20e55e3..e21d98d 100644
--- a/web/plugins/wato/check_parameters_nfsiostat.py
+++ b/web/plugins/wato/check_parameters_nfsiostat.py
@@ -73,36 +73,36 @@ register_check_parameters(
             Tuple(
              title=_("Write size /s"),
              elements=[
-               Float(title=_("Warning at"), default_value=200.000, unit="bytes/s"),
-               Float(title=_("Critical at"), default_value=250.000, unit="bytes/s"),
+               Float(title=_("Warning at"), default_value=None, unit="bytes/s"),
+               Float(title=_("Critical at"), default_value=None, unit="bytes/s"),
             ])),
         ("write_b_op",
             Tuple(
              title=_("Write bytes per operation"),
              elements=[
-               Float(title=_("Warning at"), default_value=200.000, unit="bytes/s"),
-               Float(title=_("Critical at"), default_value=250.000, unit="bytes/s"),
+               Float(title=_("Warning at"), default_value=None, unit="bytes/s"),
+               Float(title=_("Critical at"), default_value=None, unit="bytes/s"),
             ])),
         ("write_retrans",
             Tuple(
              title=_("Write Retransmissions"),
              elements=[
-               Percentage(title=_("Warning at"), default_value=10.0),
-               Percentage(title=_("Critical at"), default_value=20.0),
+               Percentage(title=_("Warning at"), default_value=None),
+               Percentage(title=_("Critical at"), default_value=None),
             ])),
         ("write_avg_rtt_ms",
             Tuple(
              title=_("Write Avg RTT (ms)"),
              elements=[
-               Float(title=_("Warning at"), default_value=10.000, unit="ms"),
-               Float(title=_("Critical at"), default_value=20.000, unit="ms"),
+               Float(title=_("Warning at"), default_value=None, unit="ms"),
+               Float(title=_("Critical at"), default_value=None, unit="ms"),
             ])),
         ("write_avg_exe_ms",
             Tuple(
              title=_("Write Avg exe (ms)"),
              elements=[
-               Float(title=_("Warning at"), default_value=10.000, unit="ms"),
-               Float(title=_("Critical at"), default_value=20.000, unit="ms"),
+               Float(title=_("Warning at"), default_value=None, unit="ms"),
+               Float(title=_("Critical at"), default_value=None, unit="ms"),
             ])),
        ]
    ),