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bosch highflow 400 making loud hissing noise?

my boiler is making a loud hissing noise and the pump is very hot and it cuts out when heating or hot water is switched on.anyone have any ideas??

mario
November 2008
BoschBosch Highflow 400Heating, Home Heating SystemsBoiler Heating Bosch Highflow
You've already spoken to Worcester about this today, haven't you?

BunSlinger
November 2008

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Bosch Highflow 400 Hissing Noise - Help!