diff --git a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomerateLduAddressing.C b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomerateLduAddressing.C
index 4036107e96..321e8f3d3d 100644
--- a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomerateLduAddressing.C
+++ b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomerateLduAddressing.C
@@ -374,10 +374,6 @@ void Foam::GAMGAgglomeration::procAgglomerateLduAddressing
     const lduMesh& myMesh = meshLevels_[levelIndex-1];
 
 
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = meshComm;
-
-
     procAgglomMap_.set(levelIndex, new labelList(procAgglomMap));
     agglomProcIDs_.set(levelIndex, new labelList(procIDs));
     procCommunicator_[levelIndex] = allMeshComm;
@@ -435,8 +431,6 @@ void Foam::GAMGAgglomeration::procAgglomerateLduAddressing
     {
         clearLevel(levelIndex);
     }
-
-    UPstream::warnComm = oldWarn;
 }
 
 
diff --git a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolver.C b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolver.C
index a30b67c76a..81a28869d5 100644
--- a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolver.C
+++ b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolver.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -253,13 +253,6 @@ Foam::GAMGSolver::GAMGSolver
 
             if (matrixLevels_.set(coarsestLevel))
             {
-                const lduMesh& coarsestMesh =
-                    matrixLevels_[coarsestLevel].mesh();
-
-                label coarseComm = coarsestMesh.comm();
-                label oldWarn = UPstream::warnComm;
-                UPstream::warnComm = coarseComm;
-
                 coarsestLUMatrixPtr_.set
                 (
                     new LUscalarMatrix
@@ -269,8 +262,6 @@ Foam::GAMGSolver::GAMGSolver
                         interfaceLevels_[coarsestLevel]
                     )
                 );
-
-                UPstream::warnComm = oldWarn;
             }
         }
     }
diff --git a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverAgglomerateMatrix.C b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverAgglomerateMatrix.C
index 58a8da4dd3..36f34f2af1 100644
--- a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverAgglomerateMatrix.C
+++ b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverAgglomerateMatrix.C
@@ -433,14 +433,8 @@ void Foam::GAMGSolver::procAgglomerateMatrix
         interfaceLevelsIntCoeffs_[levelI];
     const lduMesh& coarsestMesh = coarsestMatrix.mesh();
 
-
     label coarseComm = coarsestMesh.comm();
 
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = coarseComm;
-
-
-
     // Gather all matrix coefficients onto agglomProcIDs[0]
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -731,7 +725,6 @@ void Foam::GAMGSolver::procAgglomerateMatrix
         //    }
         //}
     }
-    UPstream::warnComm = oldWarn;
 }
 
 
diff --git a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverSolve.C b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverSolve.C
index c4157d57f2..8f14752f1f 100644
--- a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverSolve.C
+++ b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/GAMGSolverSolve.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -556,8 +556,6 @@ void Foam::GAMGSolver::solveCoarsestLevel
     const label coarsestLevel = matrixLevels_.size() - 1;
 
     label coarseComm = matrixLevels_[coarsestLevel].mesh().comm();
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = coarseComm;
 
     if (directSolveCoarsest_)
     {
@@ -595,9 +593,6 @@ void Foam::GAMGSolver::solveCoarsestLevel
     //    //solverPerformance coarseSolverPerf;
     //
     //    label solveComm = agglomeration_.procCommunicator(coarsestLevel);
-    //    label oldWarn = UPstream::warnComm;
-    //    UPstream::warnComm = solveComm;
-    //
     //
     //    coarsestCorrField = 0;
     //    solverPerformance coarseSolverPerf;
@@ -645,7 +640,6 @@ void Foam::GAMGSolver::solveCoarsestLevel
     //        }
     //    }
     //
-    //    UPstream::warnComm = oldWarn;
     //    Pout<< "done master solve." << endl;
     //
     //    //// Scatter to all processors
@@ -709,8 +703,6 @@ void Foam::GAMGSolver::solveCoarsestLevel
             coarseSolverPerf.print(Info.masterStream(coarseComm));
         }
     }
-
-    UPstream::warnComm = oldWarn;
 }
 
 
diff --git a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaceFields/processorGAMGInterfaceField/processorGAMGInterfaceField.C b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaceFields/processorGAMGInterfaceField/processorGAMGInterfaceField.C
index 852caef35f..8c6f4318ac 100644
--- a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaceFields/processorGAMGInterfaceField/processorGAMGInterfaceField.C
+++ b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaceFields/processorGAMGInterfaceField/processorGAMGInterfaceField.C
@@ -99,9 +99,6 @@ void Foam::processorGAMGInterfaceField::initInterfaceMatrixUpdate
     const Pstream::commsTypes commsType
 ) const
 {
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = comm();
-
     procInterface_.interfaceInternalField(psiInternal, scalarSendBuf_);
 
     if
@@ -140,8 +137,6 @@ void Foam::processorGAMGInterfaceField::initInterfaceMatrixUpdate
     }
 
     const_cast<processorGAMGInterfaceField&>(*this).updatedMatrix() = false;
-
-    UPstream::warnComm = oldWarn;
 }
 
 
@@ -159,9 +154,6 @@ void Foam::processorGAMGInterfaceField::updateInterfaceMatrix
         return;
     }
 
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = comm();
-
     const labelUList& faceCells = procInterface_.faceCells();
 
     if
@@ -209,8 +201,6 @@ void Foam::processorGAMGInterfaceField::updateInterfaceMatrix
     }
 
     const_cast<processorGAMGInterfaceField&>(*this).updatedMatrix() = true;
-
-    UPstream::warnComm = oldWarn;
 }
 
 
diff --git a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaces/processorGAMGInterface/processorGAMGInterface.C b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaces/processorGAMGInterface/processorGAMGInterface.C
index f68e1a853b..c3f64cdc26 100644
--- a/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaces/processorGAMGInterface/processorGAMGInterface.C
+++ b/src/OpenFOAM/matrices/lduMatrix/solvers/GAMG/interfaces/processorGAMGInterface/processorGAMGInterface.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -195,12 +195,7 @@ void Foam::processorGAMGInterface::initInternalFieldTransfer
     const labelUList& iF
 ) const
 {
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = comm();
-
     send(commsType, interfaceInternalField(iF)());
-
-    UPstream::warnComm = oldWarn;
 }
 
 
@@ -210,13 +205,8 @@ Foam::tmp<Foam::labelField> Foam::processorGAMGInterface::internalFieldTransfer
     const labelUList& iF
 ) const
 {
-    label oldWarn = UPstream::warnComm;
-    UPstream::warnComm = comm();
-
     tmp<Field<label>> tfld(receive<label>(commsType, this->size()));
 
-    UPstream::warnComm = oldWarn;
-
     return tfld;
 }