I have a vokera compact 24 mtn about 4 years old the hot water flow has been getting progressively less and less but the water is still warm enough.Local heating guy reckons its the diaphram but looking at the exploded parts list i noticed a flow govenor could this be the problem.

Ian maclean, January 2008

Try removing the 'o-ring' between the cold inlet pipe and the heat exchanger, you'll find it on the restrictor unless it's already been removed!

Big A, January 2008