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worcester boiler when running hot water red light comes on when running water but water does not get hot than red light starts flashing
any ideas people.

My friend recently had a very similar problem with old 28i junior combi. His red light flashed about once per second. Looking in the manual for that boiler it states several problems, but when he called out the Worcester Bosch engineer he said " it was the water control switch that had gone so he had to fit a new one", this was after testing a few other components.

Unless it's a low water pressure problem in the sealed system (that can be alleviate by opening the filling loop) you will find that you will need the help of a CORGI engineer who is able to test the parts and locate the exact problem.

As adamsheating says, the number of times the light flashes indicates what the possible faults could be. Try following the diagram in the back of the boiler instruction manual.

Does the boiler reset ?

htg