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worseter bosch boilers?

hi we have a greenstar cdi conventional that on start up makes a loud vibration noise until the speed settles about 2 mins
graham, July 2008
yes

teddy, October 2008
how to recharge greenstar 24i junior

teddy, October 2008
sound like cavitation caused by air in the system, is the autovent open?

Dr combi, July 2008
link Click here to see other fixes for Bosch.