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boiler over heating?

boiler comes on when the boiler is hot water only, it then overheats and knocks off heating flow gets very hot and return cold makes a lot of noise and knocks off
potterton puma 80
murphy, January 2010
Your DHW flow switch is stuck, can be easily stripped, cleaned and lubricated

Henry, January 2010
link Click here to see other fixes for Potterton 80.