diff --git a/documentation/proc-pages/physics-models/plasma.md b/documentation/proc-pages/physics-models/plasma.md
index fff2c5ee3d..9ae5863f15 100644
--- a/documentation/proc-pages/physics-models/plasma.md
+++ b/documentation/proc-pages/physics-models/plasma.md
@@ -267,6 +267,11 @@ simulations.
 If `ipedestal` = 1 or 2 then the pedestal density `neped` is set as a fraction `fgwped` of the 
 Greenwald density (providing `fgwped` >= 0).  The default value of `fgwped` is 0.8[^7]. 
 
+!!! warning " Un-realistic profiles"
+
+    If `ipedestal >= 1` it is highly recommended to use constraint equation 81 (icc=81). This enforces solutions in which $n_0$ has to be greater than $n_{ped}$. 
+    Negative $n_0$ values can also arise during iteration, so it is important to be weary on how low the lower bound for $n_e (\mathtt{dene})$ is set.
+
 ## Beta Limit
 
 The plasma beta limit[^7] is given by 
diff --git a/process/profiles.py b/process/profiles.py
index 339c30f763..5e8947048b 100644
--- a/process/profiles.py
+++ b/process/profiles.py
@@ -3,10 +3,7 @@
 from scipy import integrate
 from abc import ABC, abstractmethod
 
-from process.fortran import (
-    maths_library,
-    physics_variables,
-)
+from process.fortran import maths_library, physics_variables, error_handling
 
 logger = logging.getLogger(__name__)
 # Logging handler for console output
@@ -127,7 +124,9 @@ def calculate_profile_y(self, rho, rhopedn, n0, nped, nsep, alphan):
         )
 
     @staticmethod
-    def ncore(rhopedn, nped, nsep, nav, alphan):
+    def ncore(
+        rhopedn: float, nped: float, nsep: float, nav: float, alphan: float
+    ) -> float:
         """This routine calculates the core denesity of a pedestalised profile.
 
         :param rhopedn: normalised minor radius pedestal position
@@ -138,11 +137,10 @@ def ncore(rhopedn, nped, nsep, nav, alphan):
         :type nsep: float
         :param nav: electron density (/m3)
         :type nav: float
-        :param alphan: _description_
         :param alphan: density peaking parameter
         :type alphan: float
         :return: Core density
-        :rtype: numpy.array
+        :type: float
         """
 
         ncore = (
@@ -155,15 +153,11 @@ def ncore(rhopedn, nped, nsep, nav, alphan):
             )
         )
 
-        if ncore < 0:
-            # Prevent ncore from going negative (and terminating the optimisation) by
-            # kludging to small positive value. Allows solver to continue and
-            # hopefully be constrained away from this point (e.g. constraint 81, ne0 > neped)
-            logger.exception("ncore is negative. Kludging to 1e-6.")
+        if ncore < 0.0:
+            # Allows solver to continue and
+            # warns the user to raise the lower bound on dene if the run did not converge
+            error_handling.report_error(282)
             ncore = 1.0e-6
-            # raise ValueError(
-            #     f"Core density is negative: {ncore}. {nped = }, {nsep = }, {nav = }"
-            # )
         return ncore
 
     def set_physics_variables(self):
diff --git a/process/utilities/errorlist.json b/process/utilities/errorlist.json
index 7aa7d672be..d39f74ed14 100644
--- a/process/utilities/errorlist.json
+++ b/process/utilities/errorlist.json
@@ -8,7 +8,7 @@
   "comment2": [
     "Increment n_errortypes if an error is added to this list"
   ],
-  "n_errortypes": 281,
+  "n_errortypes": 282,
   "errors": [
     {
       "no": 1,
@@ -1414,6 +1414,11 @@
       "no": 281,
       "level": 3,
       "message": "CHECK: Cannot have i_tf_bucking >= 2 when tf_in_cs = 1"
+    },
+    {
+      "no": 282,
+      "level": 2,
+      "message": "CHECK: ncore is going negative when solving. Please raise the value of dene and or its lower limit."
     }
   ]
 }
diff --git a/source/fortran/iteration_variables.f90 b/source/fortran/iteration_variables.f90
index 72df52766f..08070f13b8 100755
--- a/source/fortran/iteration_variables.f90
+++ b/source/fortran/iteration_variables.f90
@@ -148,7 +148,7 @@ subroutine init_itv_6
     use numerics, only: lablxc, boundl, boundu
     implicit none
     lablxc(6) = 'dene          '
-    boundl(6) = 1.00D19
+    boundl(6) = 2.00D19
     boundu(6) = 1.00D21
   end subroutine init_itv_6
 
@@ -3244,8 +3244,8 @@ subroutine init_itv_145
     use numerics, only: lablxc, boundl, boundu
     implicit none
     lablxc(145) = 'fgwped        '
-    boundl(145) = 0.500D0
-    boundu(145) = 1.000D0
+    boundl(145) = 0.100D0
+    boundu(145) = 0.9D0
   end subroutine init_itv_145
 
   real(kind(1.d0)) function itv_145()
@@ -3377,7 +3377,7 @@ subroutine init_itv_152
     implicit none
     lablxc(152) = 'fgwsep        '
     boundl(152) = 0.001D0
-    boundu(152) = 1.000D0
+    boundu(152) = 0.5D0
   end subroutine init_itv_152
 
   real(kind(1.d0)) function itv_152()