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Can any one help, i am trying to determine whether i need to replace my main driver board on my worcester bosch 280 rsf or the regulator valve. The output voltage from the PCB to the Regulator remains constant holding the gas open fully until the boiler hits over temp trip. how should this...

Can someone help me please!! I have a worcester bosch 280 rsf combi boiler and I am having snags with the domestic hot water, when the tap has been running for a short while the water in the boiler sounds as if its boiling and the gas cuts off, then after a while it re-ingnites and continues the...