diff --git a/src/thermophysicalModels/solids/C/C.C b/src/thermophysicalModels/solids/C/C.C
index 1dbcfd2eed..e36eb71870 100644
--- a/src/thermophysicalModels/solids/C/C.C
+++ b/src/thermophysicalModels/solids/C/C.C
@@ -42,9 +42,12 @@ Foam::C::C()
 :
     solid(2010, 710, 0.04, 0.0, 1.0)
 {
-    WarningIn("C::C()")
-        << "Properties of graphite need to be checked!!!"
-        << endl;
+    if (debug)
+    {
+        WarningIn("C::C()")
+            << "Properties of graphite need to be checked!!!"
+            << endl;
+    }
 }
 
 
diff --git a/src/thermophysicalModels/solids/CaCO3/CaCO3.C b/src/thermophysicalModels/solids/CaCO3/CaCO3.C
index 77a4398322..6a84f46c4c 100644
--- a/src/thermophysicalModels/solids/CaCO3/CaCO3.C
+++ b/src/thermophysicalModels/solids/CaCO3/CaCO3.C
@@ -42,9 +42,12 @@ Foam::CaCO3::CaCO3()
 :
     solid(2710, 850, 1.3, 0.0, 1.0)
 {
-    WarningIn("CaCO3::CaCO3()")
-        << "Properties of CaCO3 need to be checked!!!"
-        << endl;
+    if (debug)
+    {
+        WarningIn("CaCO3::CaCO3()")
+            << "Properties of CaCO3 need to be checked!!!"
+            << endl;
+    }
 }
 
 
diff --git a/src/thermophysicalModels/solids/ash/ash.C b/src/thermophysicalModels/solids/ash/ash.C
index c904131aab..e666638d77 100644
--- a/src/thermophysicalModels/solids/ash/ash.C
+++ b/src/thermophysicalModels/solids/ash/ash.C
@@ -42,9 +42,12 @@ Foam::ash::ash()
 :
     solid(2010, 710, 0.04, 0.0, 1.0)
 {
-    WarningIn("ash::ash()")
-        << "Properties of ash need to be checked!!!"
-        << endl;
+    if (debug)
+    {
+        WarningIn("ash::ash()")
+            << "Properties of ash need to be checked!!!"
+            << endl;
+    }
 }